This is the doujin/extra version to the BL undercover investigator buddy duo "Violation! Undercover Investigator" series, serialized in KachiCOMI!

Vol.1: The uke/bottom rookie investigator, Reona, is a passionate man who has poor luck... and a sexy body with large inverted nipples. He was often caught by the enemy, and be subjected to naughty questioning!

This is his daily story of loving and intense SM sex with Satsu Takase, a cool devilish senior partner investigator and pushy lover who loves SM play.

Official Translations:
English, S.Chinese, T.Chinese, Korean

Vol.2: Caught by the human trafficking organization he was investigating undercover again, Reona ends up being auctioned off as a sex pet!

Waiting for him there pretending to be an enemy... is his cool and brutal buddy investigator, unsolicited lover, seme/top, who loves SM play!

Reona is teased and tormented on an electrically powered wooden horse in front of a crowd...

Official Translations:
English, T.Chinese, Korean

Vol.3: A hot-blooded rookie investigator who is caught and sexually tormented again! This time featuring electric massager stimulation, urethral jelly torment, and massive cumshots! Can Reona endure the humiliating violation!?

Official Translations:
English, S.Chinese, T.Chinese

Vol.4: Each time he tries to infiltrate, he always gets caught in the same perverted situation.
The hot-blooded newbie investigator, Reona Kido (uke), with big breasts, inverted nipples, and a super erotic body, needs to buy time until rescue arrives by undergoing perverted play. The epic tale of daily loving SM plays with the cool and sadistic senior investigator, Sumeragi Takase (seme).

Official Translations:
English, S.Chinese, T.Chinese