Haruno Usagi, a university student, has a crush on Kurosaki Ritsu, a classmate. Although he was invited to join the same club, Usagi doesn't have the courage to talk to him. Still, wanting to see him up close, Usagi secretly takes photos of Ritsu, filling her heart. However, at a club drinking party in her fourth year of university, Honoka reveals that Usagi has secretly kept photos of Ritsu. Usagi is depressed after her beloved Ritsu finds out about her stalker-like behavior, and on her way home, she witnesses Ritsu and Honoka together.(It's all her own doing.) At the park, overwhelmed by heartbreak and self-blame, Usagi tries to delete the photos of Ritsu, but... "Wow, that's amazing. This is a good photo," Ritsu, who was behind her, stops her. Usagi is confused. While she couldn't comprehend the situation, Ritsu held her tightly... "There's nothing to be scared of, Haruno. Come here." Rather than getting angry, he kissed her and brought her to his house, where she was stripped naked and had sex with Ritsu...?! "You can cum inside me, right? I've done it alone before." Usagi tries to run away, but Ritsu catches her just as she is about to reach the front door. Usagi is taken to Ritsu's room and witnesses a shocking sight──…… "I've always wanted to do this. I couldn't wait to make you a mess." "I've always wanted you to come to my side." Her body and mind are melted into a mess by the extremely obsessive mating of the obsessive Kurosaki-kun.