Imprisoned by the yakuza, he can only trust and protect his delicate girlfriend, who has fallen into depravity due to drugs, sex, and promiscuity, for a week. Aya Sasakura DSOD-037

During my happy days with my girlfriend, one day a group of gangsters suddenly appeared. They said that Aya had been kept by the gang as a debtor and had escaped. They tried to take Aya away, but ended up being kidnapped themselves. The gangsters imprisoned us, saying they would release us if Aya could endure a week of special training.