Yuujin ni 500-en Kashitara Shakkin no Kata ni Imouto wo Yokoshitekita no Dakeredo, Ore wa Ittai Dou Sureba Iin Darou
友人に500円貸したら借金のカタに妹をよこしてきたのだけれど、俺は一体どうすればいいんだろう
A university student named Motomu Shiragi is visited by Akari Miyamae, his friend's younger sister, who announces she will stay at his apartment until he repays a 500-yen debt. She offers herself as collateral for the unpaid amount. The situation raises questions about the origin of the debt and Akari's true intentions. The story follows the comedic events that unfold as a result of this unusual arrangement.
