The men and women shut in a cramped space with nothing but a bed are people carrying debt and formally assessed as unable to repay it. It's a social experiment against the falling birth rate: get her pregnant and the debt is wiped. Manage to cum inside and implant, and you can leave the room. The only woman is Rei, an office worker at the end of her rope who poured money into host clubs and owes several consumer finance firms. In a space with only one woman, creampieing her was necessarily the only way any of them was getting out. A man with no morals who takes the chance to rape her. A man who actually wants her but tries to protect her. A timid man too guilty to touch anything. Everyone's despair, conflict and sex drive mixed into one group creampie orgy.