Kurokiya Ruu is on the verge of repeating a year so her childhood friend steps up to teach her: his name is Tadashi Tadao (name literally translates to *straightforward man*). However, they end up not getting any studying done as she uses this situation to try and seduce him at every turn. The story of a girl who wants to get her crush flustered and the straightforward guy who won\t get embarrassed.