Hajime and Rei were childhood friends and lived in the same neighborhood. They weren't boyfriend and girlfriend, but neither of them had a good home life. Hajime grew up in a single-parent household. His father was violent and addicted to gambling. Rei grew up in a single-parent household. His mother was amorous and had an affair with Hajime's father. Hajime's father took all the money Hajime had earned from his part-time job and ran off with Rei's mother... leaving the two of them alone as a weak boy and girl. With no money or anything left, the two of them stayed close to each other and had sex all the time in the empty house, but...