My name is Matsukawa. Since my parents often work away from home, I started living on my own. However, it wasn't even six months before I started living together with my classmate Sakuramachi-san, who loudly proclaimed that she was a real succubus. I had never even dared to talk to her before, and honestly, I had never seen her talk to anyone at all. It was very strange and unexpected. I walked her into my room without the slightest suspicion. She seemed like a completely ordinary and unsociable girl, but at the same time she was incredibly popular with guys. "If I could get close to her through this..." - I couldn't deny that I had no such thoughts. However, that night I was the one who was attacked and raped to unconsciousness. Sakuramachi-san needs constant sperm absorption and moved in with me in search of a steady source of energy...