"A decorative button that's hidden away...is like having a secret."
Nana has a secret. Even since her "dear kouhai" exchanged buttons with hers, Nana hasn't been able to get her out of her mind. Everyday she yearns to close the gap between them.
Unfortunately, not everyone's feelings are the same, and while one might feel love towards the other, the opposite might not necessarily be true.
Uncertain of where her kouhai's feelings lie, Nana is reluctant to move forward. After all, wouldn't it be better to remain senpai and kouhai, than to have her dear kouhai hate her?
If only she knew how deep her feelings ran. Her crush, her kouhai, her button...
