In the debauched world of Shihai no Kyoudan, a sinister religious cult expands its power by using a mind-control smartphone app and their members' 'holy semen' to systematically corrupt and enslave women. The story follows a devout cultist as he targets a series of innocent females, starting with his sweet childhood friend, Yumi. He masterfully manipulates her, forcing her to submit to his every carnal whim, filming her degradation and using the app to shatter her will. Her pussy is ruthlessly trained to crave his cock and the cult's seed. The corruption spreads to Yumi's beautiful mother, the prim and proper student council president, and even a strict teacher. Each woman is meticulously broken, their minds overwritten with hypnotic triggers that turn them into mindless, cum-hungry fuck-slaves. They are gangbanged by cult members, their bodies used as receptacles for holy insemination, until their original personalities are erased, leaving only blissful obedience and an insatiable lust for the cult's cocks.