Yuuki Kamijou is struggling to make ends meet when he suddenly finds himself burdened with a debt of five million. His father's hardships drove him to despair and alcoholism, leaving Yuuki with the consequences. However, when he wakes up from a drunken stupor, he discovers he's surrounded by ¥10,000 bills and a half-naked stranger offering to pay off his debt. Yuuki's confused and uneasy, but he runs away, only to encounter the mysterious Nao once more. Nao has a proposition for Yuuki - he'll pay off the debt, but Yuuki must repay it through manual labor. Yuuki's left with a tough choice and a one-shot story, Endless World.
