Yuu Aoba has a problem. He is in love with his mother, Mieko. And he has trouble keeping her eyes open when she wears light clothing in the summer. Then, she starts playing with his friend, Taiki Shimosaka, in her room. However, his mother, who welcomes him, is not comfortable with her thin clothes. Eventually, he starts playing with a girl who knows Taiki, Izawa Hinano. One day, two of his friends discover a pornographic video of his mother that he had been hiding. Yuu is pointed out as a motherfucker, and is tormented by shame and guilt. The three of them continue their relationship, but the day comes when he is alone with Hinano. Yuu is teased for being a mother con, and is told that she will correct him...