Pure schoolgirl Tsukushi is dragged into an abandoned building and gradually transformed into a submissive semen-drinking pet. Depicted performing deep throat, her eyes filled with tears as she sobs, she is forced to gulp down semen repeatedly. Held captive in a prison cell, she is made to obey as a devoted semen-drinking pet, subjected to obsessive semen-drinking acts. Scenes of semen play, punishment, and humiliating gulping unfold as she swallows thick, concentrated sperm. Whispering, "Please make me drink lots of bitter sperm..." she fully transforms into a masochistic slave.