Tatsuki and Minami were a married couple in their second year of marriage. Their relationship was very good, and they lived happily together.

One day, they received the news of Minami's father's death. Minami, who had grown up in a single-parent household, was deeply saddened, but with Tatsuki's support, she was slowly trying to overcome her grief. Some time later, a man named Shima, who was her father's friend and ran a loan business, came to their home and said:

"Please repay the debt your father left behind."

After discussing and agonizing over it, the couple decided to take on the debt. Their life, which wasn't particularly affluent, was further burdened by the debt. Tatsuki, trying to do everything he could, overworked himself and fell ill. Seeing this, Minami, recalling her father, made a decision. Shima offered a proposition—Minami would repay the debt with her body...