<Tr> <Th> LC Class </Th> <Td> PZ7. P44158 Lu 2004 </Td> </Tr> <P> Luna is a young adult novel, by Julie Anne Peters, and was first published in 2004 . </P> <P> Luna follows the life of sixteen - year - old Regan as she keeps the secret of her older sister Luna's transgender identity . During the day, Luna pretends to be an average senior boy named Liam . But at night, Luna is allowed to be her true self: Lia Marie, a girl . Later, she changes her female name to Luna, which means "moon", to reflect that her true identity could only be seen at night . After years of' transforming' only at night, Luna confides in her sister that she wants to transition into a full - time female . Luna asks Regan to help her with her transitioning and, although she agrees, she finds herself worried about Luna and her safety . The novel follows Regan as she makes sense of her sister's decision . </P> <P> Other problems arise for Regan as she is attending high school . She spends most of her life avoiding other students, in fear of letting the secret slip . But a new boy at school, Chris, becomes interested in her . Although Regan enjoys attention from Chris, she draws away from him, choosing to stay focused on Luna . </P>

What does luna announce to regan at the start of the story
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