Kanna, a student at a university in Tokyo, is an ordinary female college student who lives with her father, who lost her mother. However, her father has a hobby of gambling, and in an instant he gets carried away and secretly makes his daughter a guarantor and borrows money from a shady loan shark. While her father is in the hospital, Kanna is kidnapped by the shady loan sharks. The girl, who loves her parents, falls into the fate of being forced to work in order to repay her father's debts...