A 3rd year high school student named Honoka Miyamae and her teacher named Ryouma Kiryuu are cousins and they are very close. Both of them are keeping this a secret, due to the possibility of him getting a job transfer if people around them were to find out.

Honoka, who is trying to make her feelings of affection reach Ryouma, often comes over to his house in the neighborhood where he lives alone, where she tries to appeal to him; but she just can't quite get him to lay a hand on her...

One day, Honoka's parents were fighting again which made it hard for her to be at home, so she finds herself staying at Ryouma's house for longer than usual; In order to get him to see her as a woman rather than a cousin, she begins her "approach" and follows him into the bath!

(Source: DLsite)