Manabu, a fatherless family, secretly admires his friend's mother, Yuka. And before she knows it, her feelings turn to her love... At that time, Manabu felt a sexual awakening due to the lewd behavior he happened to witness, but he spent a lot of time in agony because he didn't know how to vent about it. Yuka learns of his troubles and secretly tries to teach her... Then, Manabu, unable to suppress her rationality due to the stimulus she felt for the first time, goes wild and attacks her.