両親が突然不在…残された幼馴染とコンドームを買うお金もなく中出ししまくった日々 久留木玲

In the plot, Hajime and Rei are friends, both living in the same building, both coming from very humble backgrounds, and both with broken families having just single parents, a Mom and a Dad, that eventually get together in an affair. However one day the parents suddenly disappear and the 2 friends are left alone, not knowing any better they begin to pass the days f*cking. A few days later, the abusive Father of Hajime eventually returns not realizing that things have already changed a lot.