Kaito moves from his technical school into the fitness world as a gym trainer and runs into Michiko, Yuuki, and Hikari — three friends from his past, each carrying a different emotional significance in his life. Managing his feelings for each of them grows more complicated when Aya arrives in town: outgoing, charismatic, and immediately pulling Kaito's attention in a new direction. A web of affections that was already intricate becomes even harder to navigate.