Fault!!

There are only five people in the school's tennis club, and Shuichi is one of them, but he still enjoys his pastime. The guy's life was monotonous: home - school -club - and home again. This routine continued until his graduation, when he suffered an accident that severely affected his condition and required special care. In such a situation, one of his girlfriends, who is also a member of the tennis club, took care of him.

However, the hero's younger sister, Mio, did not like this act of kindness at all, because she believes that her brother belongs only to her. Shuichi faced difficulties in trying to resolve the conflict. However, soon a quarrel between a friend and a sister brought the patient completely unexpected consequences, different from what he expected.