<P> The background music for the series was composed by Yasuharu Takanashi . For the first season, two pieces of theme music were used . The opening theme, titled "Blade of Hope", is performed by the voice actress unit sweet ARMS . The ending theme is "Still Sis" performed by Kaori Sadohara . For the second season, two pieces of theme music were used . The opening theme is "Over The Testament", performed by Metamorphose, a unit consisting of singers Yoko Ishida, Kaori Oda, Aki Misato and Megumi Ogata . The ending theme is "Temperature" performed by Dual Flare, a duo consisting of singer Yuki Yamada and voice actress Natsumi Yamada . </P> <P> A first OVA episode was released on June 22, 2015 . A second OVA episode was released on January 26, 2016 . A third OVA episode was released on March 28, 2018 . </P> <Table> <Tr> <Th> No . </Th> <Th> Title </Th> <Th> Original air date </Th> <Th> Refs . </Th> </Tr> <Tr> <Th> </Th> <Td> "The Day I Got A Little Sister" "Imōto ga dekita hi" (妹 が でき た 日) </Td> <Td> January 7, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> At a local restaurant, Basara Tojo and his father, Jin, wait to meet Basara's new stepsisters, but they are late . After Basara goes to the bathroom to change, he encounters a red - haired girl named Mio Naruse . Mio and her retainer Maria introduce themselves to Basara . The next day, Mio wakes Basara up as part of her service . Basara gets along with his step - sisters well, and takes a family photograph . When Mio goes shopping, she is attacked by delinquents, but Basara rescues her and they escape . Later Jin leaves on a business trip, and Mio asks Basara to leave the house, and it becomes clear that Mio is actually a demon . Maria attempts to repel Basara using magic, but it fails . Basara explains that he is a member of the hero clan and forces Maria and Mio out his house . Jin calls Basara and tells him that Mio is in danger from the current demon lord's plot to take Mio's inherited strength from her father, Wilbert . Afterwards, Mio and Maria are attacked on a hill by an enemy, but Basara rushes over immediately, rescues Mio and states he came back for his family as he shows their family photograph . </Td> </Tr> <Tr> <Th> </Th> <Td> "First Contract Between Servant And Master" "Hajimete no shujū keiyaku" (初めて の 主従 契約) </Td> <Td> January 14, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> After being formally accepted into their family, Basara and Mio perform a master - servant magical pact under Maria's supervision whereas the latter mistakenly designates Basara as the master and Mio as his servant . As Mio refuses to perform the kiss of loyalty upon Basara's hand, Mio falls under an aphrodisiac curse, causing Basara to "relieve" Mio by caressing her weak spots, and later resulting in Maria being punished by Mio . After transferring to Mio's school, Yuki Nonaka, Basara's childhood friend, reunites with Basara by embracing him in front of Mio and his new class, which causes further uproar as Mio reveals she is living together with Basara under one roof . While the students are resentful for his intimate relationship with both Mio and Yuki, Basara is befriended by Yahiro Takagawa . After class dismissal, Yuki warns Basara not to get involved with Mio . </Td> </Tr> <Tr> <Th> </Th> <Td> "Reunion and a Gap in Trust" "Saikai to shinrai no hazama" (再会 と 信頼 の 狭間) </Td> <Td> January 21, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> Knowing that Yuki is observing Mio in lieu of the hero clan, Basara tells Mio's history to Yuki and says that he wants to protect her . Maria arranges a mixed bath for her, Mio, and Basara to gain trust among each other until Basara collapses . At school, while being asked to help Yuki, Mio's curse activates, leading to her exhaustion . At the infirmary, Basara watches over Mio as the school nurse, Chisato Hasegawa, advises Basara to choose his friends while considering who his enemies are . After falling unconscious, stray demons attracted to Mio's strength enter the school . Yuki warns Mio to not get Basara involved, as Mio will bring harm to him . As Mio and Yuki clash, Yuki tells Mio that Basara is not powerful enough to protect her due to an incident from five years ago, which continues to haunt Basara . Basara eventually arrives to stop Yuki and Mio's fight until a stranger (who is revealed to have dispatched the demons that attempt to harm Mio) appears . The stranger informs Mio that if she becomes too much of a threat to her surroundings, the hero clan will label her as a target of observation and killing, leading to Yuki's actions . Another stranger appears behind Mio resulting in Basara attempting to protect her from it . </Td> </Tr> <Tr> <Th> </Th> <Td> "When Sadness Reaches Zero" "Kanashimi ga zero ni naru made" (悲しみ が ゼロ に なる まで) </Td> <Td> January 28, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> After wounding Basara, the stranger blames Mio for her allies for her cause . As Basara is being treated by Maria, Mio contemplates on surrendering herself and her inherited powers to the stranger to prevent her companions from harm . However, Yuki arrives to stop Mio and the stranger's departure and fight him . With the stranger overpowering Yuki, Basara and Maria arrive and defeats the villain using Basara's Banishing Shift technique . However, Basara is injured by the unknown man's demon, causing Mio to lose control of her powers . Basara recovers from his injuries and appeases Mio using his Banishing Shift . In the aftermath, Yuki provides Maria with a special medicine for Basara's recovery and expresses her joy for the latter for completely controlling his powers . At school, Basara exposes Yahiro as the stranger . Basara and Yahiro form a temporary truce as Basara holds the fact of reporting Yahiro's failure to his superiors as leverage and as act of trust from Yahiro's intention of not killing him and Maria . Yahiro then informs Basara that Zolgia killed Mio's parents . Meanwhile, Jin makes a call to an unknown recipient . </Td> </Tr> <Tr> <Th> 5 </Th> <Td> "A Little Sister's Morning Demon Lording" "Asa no imōto no maō musō" (朝 の 妹 の 魔王 無双) </Td> <Td> February 4, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> Following Yahiro's defeat, Basara wakes up with Maria lying on top of him while seducing him, inadvertently encountering Mio naked in the bathroom, Yuki offering herself to bathe with Basara, and Mio suffering her curse once again . At a local restaurant, Yahiro informs Basara that his allies are planning to send reinforcements to observe Mio, as well as further details on the effects of the curse that is infused in Basara and Mio's pact . Chisato soon joins Basara and Yahiro's table and afterwards, Basara confides with Chisato about his recent dilemmas . Meanwhile, Yahiro meets up with the sent reinforcements as he receive orders from Zest, Zolgia's protégé . After having confirmed from Maria about his findings regarding the effects on Mio's curse, Basara and Maria play a dating sim as reference for gaining trust between Basara and Mio until Maria is dragged off by Mio . Meanwhile, a trio of hero clan members, Kyōichi Shiba, Takashi Hayase and Kurumi Nonaka, plot to kill Mio . After rescuing Basara from a group of his school's delinquents, Yuki asks Basara on a date . </Td> </Tr> <Tr> <Th> 6 </Th> <Td> "Bearing Growing Emotions" "Tsunoru Omoi o Kakaete" (募る 思い を 抱え て) </Td> <Td> February 11, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> During their date, Mio arrives to interfere with Basara and Yuki . As Yuki is separated from the group, a demon named Valga attacks Basara, Mio, and Maria . Valga is soon defeated by Takashi and his weapon, Byakko . Shiba introduces himself as an observer and declares a 3v3 match against Basara and his companions happening in a week . After gaining approval and support from Jin, Basara and the others undergo rigorous training for their upcoming match . After several training sessions, Basara and Mio get intimate to build up their camaraderie and as well as their powers . Aware of the upcoming match between Basara and Shiba, Yahiro tells Basara he will have to interfere and kill the hero clan members, including Yuki, if they intend to kill Mio . Basara, after declining Yuki's request to withdraw from their battle, hands her a spare key to his house . At the designated location for their match, both parties ready themselves . </Td> </Tr> <Tr> <Th> 7 </Th> <Td> "The Depths of Love and Hatred" "Onshū no hate ni" (恩 讐 の 果て に) </Td> <Td> February 18, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> In the ensuing battle between the heroes and the demons, Basara uses his Banishing Shift on Kurumi to nullify her attacks, while Maria and Mio duel Takashi . Yuki puts Basara to sleep and assists Maria in fighting Takashi . As Kurumi watches over Basara sleeping, Mio calls out to him to wake him up . Basara saves Mio from certain death by blocking Takashi's attack . As Takashi struggles to defend against Basara, his spear - Byakko - sensing danger to his wielder, manifests into a guardian beast . Basara and Yuki eventually overpower Byakko . Takashi asks Basara to kill him, but Basara declines and states they are friends . Mio lectures Takashi for ridiculing Basara . With the weakened barrier, Shiba enters the battlefield and announces their leave due to the consequences of Byakko losing control in their fight, bringing Yuki along with him . </Td> </Tr> <Tr> <Th> 8 </Th> <Td> "Erotic Succubus Out of Control" "Bōsō no erosakyubasu" (暴走 の エロ サキュバス) </Td> <Td> February 25, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> Ten days have passed since the incident with the heroes . Yuki tells Basara that she will live with them to monitor Mio, and Maria offers Yuki to accept a Master / Servant pact with Basara the next full moon . On the day of the full moon, the girls are in swim class and Basara sees Maria running around the school . He finds her and is led to all sorts of places (the girls rest room and the roof where a couple are having sex). When they end up in the changing room, Maria finds Mio's locker and puts her panties on Basara's head . Before he can take them off, the girls return from swim class forcing the pair to hide in Mio's locker and for Maria to trick Basara . When Mio finds them, she attacks them in the locker but understands that they are only there for her safety . This sets off the curse, which Basara makes her submit using the shower head - increasing their powers . Maria meets Lars for some needed information . In the Demon realm the Zolgia watches the fight and Mio's development, he stages another plan to capture her . </Td> </Tr> <Tr> <Th> 9 </Th> <Td> "Merits and Demerits of Master and Servant" "Shujū no kōzai" (主従 の 功罪) </Td> <Td> March 4, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> Maria forges the new Master / Servant pact with Basara and Yuki . Finding her buttocks as her sensitive area, Basara and Yuki are also able to level up . The group then goes to take a bath together for a little bonding time . The next day, Mio and Yuki befriend each other, but then Basara gets injured during basketball practice . At the infirmary, Chisato tells Basara to keep on his path to hold those he cares for close . While Basara is changing, one of Mio's friends asks him if she can get close too, but then comes on strong . Mio and Yuki arrive and Mio gets jealous and runs off while Yuki realizes it is an attack and sends Basara to protect Mio . But when he gets close, Zest and Maria take Mio to Zolgia's realm . When Zolgia attempts to molest her, Maria arrives with a message from the current demon lord who commands Zolgia to help with a new ruin . In the real world, Lars and Basara discuss that Maria has turned on Mio since her mother is being held hostage, and if Zolgia rapes her she will die as Basara is her master . Basara offers Lars to help rescue Mio, but he refuses and defeats him . Lars tells Zest to turn Mio over to Lars, using Basara as a trade . </Td> </Tr> <Tr> <Th> 10 </Th> <Td> "Plaintive Betrayal" "Aisetsunaru haishin" (哀切 なる 背信) </Td> <Td> March 11, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> Lars threatens Zest and Zolgia by reporting their act of treason to the demon lord for abducting Mio and holding her in their castle if she does not comply with their trade . Zest declines and defeats Lars, before ordering Maria to subjugate Basara . Meanwhile, Yuki arrives in Zolgia's lair and clashes with Zest alongside Mio . Envying the bond Basara shares with his servants, Zest is soon defeated as is Maria, who breaks down after Basara embraces her - vowing that he will save her and everyone else . Zolgia incapacitates Mio and Yuki, and attempts to kill Zest for her failure in keeping Mio captive . However, Basara uses his Banishing Shift on Zolgia, nullifying his attack . As Basara and her servants battle the evil demon, Zolgia immobilizes Basara using his mental bondage as he approaches him to obtain his powers for himself . </Td> </Tr> <Tr> <Th> 11 </Th> <Td> "Espionage...What Lies After" "Esupionāji...Sore ga saki ni aru mono" (諜報 者 (エスピオナージ)... その 先 に ある もの) </Td> <Td> March 18, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> Basara struggles to fight against Zolgia . After temporarily disabling Basara, Zolgia faces against Maria and shows her mother's remains . Enraged to learn that Zolgia killed her foster parents, Mio exacts her revenge . Basara stops her, as Mio's future would be tainted with despair and hatred . As Zolgia retreats, Shella - Maria's mother - reveals that she is alive . Outside his lair, Zolgia battles Lars, whom the latter thought to be dead; Lars explains that he substituted himself and Shella with his puppet dummies to escape death and intends to kill Zolgia himself to avenge the death of Mio's caretakers who also fostered him as a child . As Basara and his allies escape Zolgia's lair, the barrier restraining it disappears, thus allowing it to alter itself back to its original form - a giant demonic monster . Trapped inside the beast's belly, Zest guides Basara, Mio and Yuki into the vital core of the monster and destroy it . </Td> </Tr> <Tr> <Th> 12 </Th> <Td> "For This Night, This Moment" "Kono yoru, kono toki no tame ni" (この 夜 、 この とき の ため に) </Td> <Td> March 25, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> As Yuki fends off any enemy approaching the core, Basara, Mio, and Zest soon fight against a horde of Zest's clones . The group arrives at the core and Zest offers herself as bait for Basara to kill the beast, but Basara protects Zest and kills the beast . As the girls recover, Basara witnesses Yahiro / Lars killing Zolgia . Back at their home, Zest pledges her loyalty to Basara . Opposed to the fact of someone else stealing Mio's virginity, Basara and Mio kiss and have sex until Basara stops mid-way, apologizing for forcing himself onto Mio . As Basara and Mio are about to kiss once again, Yuki kisses Basara, accompanied by Zest . As Mio and Yuki argue over Basara, the latter runs to Maria and asks her to help him appease the two . However, Maria lunges at Basara and kisses him, much to Mio and Yuki's dismay . Shella and Zest are put under the care of the demons from the moderate - faction . Meanwhile, word of Zolgia's death eventually reaches Demon Lord Leohart as he faces Jin in his throne room . </Td> </Tr> <Tr> <Th> 13 (OVA) </Th> <Td> "The Hard, Sweet Daily Life of Toujou Basara" "Tōjō Basara no hādosuwītona nichijō" (東城 刃 更 の ハード スウィート な 日常) </Td> <Td> June 22, 2015 </Td> <Td> </Td> </Tr> <Tr> <Td_colspan="4"> While preparing breakfast Maria sees that Mio is having an erotic dream and decides to use a magic spell allowing her to record Mio's dream on her camera . In her dream Mio believes Maria is Basara and allows Maria to strip her naked and almost molest her with a banana, only stopping when the real Basara arrives and punishes Maria . Later Maria tricks Basara into eating a breakfast with Mio's underwear . Basara is about to punish Maria more harshly when Yuki arrives and immediately removes her own panties so Basara can eat them as well . Upset at his refusal of her panties Yuki strips naked but Mio wakes up and subdues Basara and Maria with her lightning . At school Basara visits Chisato to treat a small cut but she is only wearing a swimsuit she cannot remove due to a broken zip . Basara manages to open the zip but accidentally exposes her breasts . Instead of being angry she invites him to dinner after school at her apartment . After cooking for him Chisato is curious about Basara's physical relationship with Mio and the others and requests that he hug her, which he does while happily claiming her cooking reminds him of how a mothers cooking should taste, though he can't remember his own mothers cooking . Chisato insists Basara bathe while she washes his clothes so he won't smell like her when he returns home . After she joins him in the bathroom Chisato admits she invited him there so she could learn what it is like to be in a relationship . An embarrassed Basara allows her to wash his back with her breasts and ends up giving her advice on how to improve her breast washing technique . Hasegawa ends up giving Basara her first ever kiss, to which he eagerly responds as they appear to have sex . However, Basara suddenly wakes up confused with his head in Chisato's lap, who claims he passed out from the excitement, though Basara appears only vaguely able to remember being in the bath with her . Chisato, now acting like his teacher once more, offers to drive him home . However, Basara chooses to walk home, claiming he has things to think about . </Td> </Tr> </Table> <Tr> <Th> No . </Th> <Th> Title </Th> <Th> Original air date </Th> <Th> Refs . </Th> </Tr>

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