One day, while I was living a happy life with my girlfriend Natsu, a group of yakuza suddenly appeared in front of us. They told us that Natsu had been kept by the yakuza as collateral for a debt, but had run away. We tried to leave with Natsu, but after a scuffle, we were both kidnapped. The yakuza then imprisoned us, promising to release us both if Natsu could endure a week of drug-induced sexual training...