"Why am I... doing it with my stepbrother...!?" Misaki, a female college student, is looking for a highly acclaimed boyfriend. She fell in love at first sight with Yuto, whom she met at her stepbrother Chihiro's drinking party. "I'll definitely make him fall for me...!" With her brilliant technique, she's able to enter Yuto's room, and now that she's alone with him, they've started to have sex. "My nipples... feel good." When she wakes up, the room is pitch black. "This time, it's my turn..." She's going for his lower body. What a sturdy dick. However, the other party is Chihiro, the person she hates the most!? Misaki rubs his dick without knowing, and Chihiro's reason is blown away by the pleasure...