After their parents remarried and formed a new family, Maika and Kanna grew close, bonding as sisters despite not being blood-related. With only a small age gap between them, they opened up to each other completely, sharing everything. Kanna knew Maika was a lesbian, but never judged her for it. Instead, she genuinely cared for Maika and treated her with kindness. One day, Maika broke up with her boyfriend. Kanna comforted her, offering gentle support through the pain. Gradually, Maika found herself emotionally depending on Kanna—until her feelings deepened into something more.