返礼のススメ

March 13th. The night before White Day. Last month, Tsukumo, age 17, received his first real valentine.
He's gotten obligation chocolate from his female friends before, and always gets a gift from his sister, but this is different. Five little chocolates in a heart-shaped tin from Chiyori, a girl he always sees on his train ride to school.
Could this be real? Does she really have feelings for him?
Tsukumo has no luck with women... if he's ever going to get a girlfriend, this may be his only shot!