<Ul> <Li> Kotoko Aihara (相原 琴子, Aihara Kotoko) (Voiced by: Nana Mizuki, Portrayed by: Aiko Sato, Honoka Miki in 2013 remake, Reina Visa in 2016 movie) - Kotoko Aihara is a ditzy and poor achieving high school student . She has been in love with the handsome and intelligent Naoki Irie since their first year in high school after hearing his speech at the opening ceremony . She eventually writes a love letter to Naoki, but is rejected right away . On the same day as her confession, Kotoko's poorly constructed house is destroyed in a mild earthquake, and she and her father Shigeo are invited to stay at a house owned by her father's close friend Shigeki . Arriving to the house, she is shocked to find out that Shigeo's friend is the dad of Naoki, and that she will be living in the same house as him . In the beginning of their new life together, Naoki often teased Kotoko, but the two eventually warm up to each other . Naoki later realizes that he is in love with Kotoko and confesses to her, and the couple marry in their first year of college (the third year in the manga version). Kotoko is known as Kotoko Irie onwards . After coming back from her honeymoon with Naoki, Kotoko decides to become a nurse, so that she could be a wife fit for Naoki . After several years of marriage, Kotoko has a daughter with Naoki named Kotomi . </Li> </Ul> <Li> Kotoko Aihara (相原 琴子, Aihara Kotoko) (Voiced by: Nana Mizuki, Portrayed by: Aiko Sato, Honoka Miki in 2013 remake, Reina Visa in 2016 movie) - Kotoko Aihara is a ditzy and poor achieving high school student . She has been in love with the handsome and intelligent Naoki Irie since their first year in high school after hearing his speech at the opening ceremony . She eventually writes a love letter to Naoki, but is rejected right away . On the same day as her confession, Kotoko's poorly constructed house is destroyed in a mild earthquake, and she and her father Shigeo are invited to stay at a house owned by her father's close friend Shigeki . Arriving to the house, she is shocked to find out that Shigeo's friend is the dad of Naoki, and that she will be living in the same house as him . In the beginning of their new life together, Naoki often teased Kotoko, but the two eventually warm up to each other . Naoki later realizes that he is in love with Kotoko and confesses to her, and the couple marry in their first year of college (the third year in the manga version). Kotoko is known as Kotoko Irie onwards . After coming back from her honeymoon with Naoki, Kotoko decides to become a nurse, so that she could be a wife fit for Naoki . After several years of marriage, Kotoko has a daughter with Naoki named Kotomi . </Li> <Ul> <Li> Naoki Irie (入江 直樹, Irie Naoki) (Voiced by: Daisuke Namikawa (drama CD), Daisuke Hirakawa (anime), Portrayed by: Takashi Kashiwabara, Yuki Furukawa (Remake - 2013), Kanta Sato in 2016 movie) - Naoki Irie is the smartest and most handsome guy in his high school . He is rumored to have an IQ of 200, and is praised by his peers as being perfect all around . He receives a love letter from Kotoko, but rejects her before she finishes confessing, explaining that he despises "dumb girls ." When Kotoko and her father move in with Naoki and his father, he gives Kotoko many hardships and maintains a rather cold attitude towards her, although he secretly began to fall in love with her, because he believed that the trouble she caused made his mundane life more interesting . Though Naoki's grades allow for him to attend any university of his choosing, he eventually decides to attend the same college as Kotoko . After his wedding to Kotoko, Naoki becomes a doctor . </Li> </Ul> <Li> Naoki Irie (入江 直樹, Irie Naoki) (Voiced by: Daisuke Namikawa (drama CD), Daisuke Hirakawa (anime), Portrayed by: Takashi Kashiwabara, Yuki Furukawa (Remake - 2013), Kanta Sato in 2016 movie) - Naoki Irie is the smartest and most handsome guy in his high school . He is rumored to have an IQ of 200, and is praised by his peers as being perfect all around . He receives a love letter from Kotoko, but rejects her before she finishes confessing, explaining that he despises "dumb girls ." When Kotoko and her father move in with Naoki and his father, he gives Kotoko many hardships and maintains a rather cold attitude towards her, although he secretly began to fall in love with her, because he believed that the trouble she caused made his mundane life more interesting . Though Naoki's grades allow for him to attend any university of his choosing, he eventually decides to attend the same college as Kotoko . After his wedding to Kotoko, Naoki becomes a doctor . </Li>

When did naoki fall in love with kotoko