"This is an undercover investigation job... please, don't say anything at all..." The task assigned to the professional investigator 'Tenkai' who returned from the United States is to conduct an undercover investigation... 'Amami' who just had sex with his colleague's investigator. This is a mission. The male (criminal) embraces unsatisfactorily, moreover, it's a sham marriage... Infusing his despised male semen into the body... Everything is a blast! An excessively harsh mission. The worst of the worst. A pitch-black mission with no glimmer of hope at all. "Investigation? This is an enforcement...".