Después de un tiempo, dos amigos se reencuentran en la secundaria, dándose cuenta de lo mucho que han cambiado, ella se enamora de él y trata de iniciar un romance, pero el es demasiado serio.

English:
Kurokiya Ruu is on the verge of repeating a year so her childhood friend Tadashi Tadao (whose name literally means straightforward man) steps up to teach her. 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.