“It’s so wet here, it’s saying you love me.” The upperclassman I admire is teasing my sensitive insides. It’s my first time, but I’m cumming…! - Kohana was asked by her friend to work as a housekeeper for her older brother, Harunobu, who is also Kohana’s first love. But Harunobu, who Kohana hasn't seen in years, has become a completely different person. He’s now a womanizer!? Kohana had had enough of him and got angry, but Harunobu kissed her gently in return, wanting Kohana to teach him what love is. She knows it’s not right, but she can’t resist him when he does perverted things to her. Is he trying to make her his friend with benefits…!?