Kana is a nurse working at a nearby hospital. Caring and kind, she treats me, her neighbor, like a younger brother. After a certain incident, I experienced both heaven and hell when I came inside her pussy, and my life began to swing like a roller coaster. When a doctor told me my sperm was useless, I was on the verge of giving up on myself—until Kana whispered, "It's not all bad. Let me make you forget the unpleasant things," and seduced me. Captivated by her words, I plunged into days of obsessive breeding, losing myself in the act of filling her again and again.