RIN×SEN + Ran→Sem Cross Mix - Excrement, into Riko's Mouth...

Story

Ichinose Riko, a former top model. Anna, who harbors an inferiority complex toward her sister. The two, who had originally been close, drifted apart, their hearts grew distant, and the place they finally arrived at was the religious group 'Believe's Lab.' In the name of 'self-liberation,' the teaching of the facility's organizer Majima Yoshimitsu, the two are made to demand lewd sexual liberation one after another. Several years pass, and the two, having earned Yoshimitsu's recognition, work at Believe's Lab as female instructors. One day, Ichinose Riko, in her instructor's uniform, is helping the male believers achieve 'liberation' as usual. Suddenly she notices her younger sister Anna is nowhere to be seen. Concerned that the sister who should always be there is missing, she heads to Majima's room. There, through the door, she overhears the content of Majima's phone call. Her sister Anna has been dispatched to 'Kokudo Academy,' where the men will kill her the moment they tire of her and sink her body into the sea... Shaking with rage at the shocking content, Riko is fully freed from the mind control and hurries away. Meanwhile, in the boys' restroom of 'Kokudo Academy,' there is Anna, naked and covered in semen. Riko rushes in and desperately explains to Anna that they've been deceived and that at this rate she'll be killed. Anna, still not out of the mind control, flies into a rage at the torrent of abuse Riko hurls at Believe's Lab...