This is a special institution that forcibly turns transsexuals into masochists. - This time's test subject ``Izumi'' resists saying, ``I'm a woman!'' But when the two slutty researchers twist her nipples, her penis becomes fully erect...! - Izumi, who already has the qualities of a masochist, ejaculates and collects semen over and over again during vacuum blowjob, hand job, and crab cowgirl sex...! - Izumi, who has completely fallen into an obedient masochist, looks forward to the 'study' of sluts...!