
In the film, Moe Tenshi plays "Minami Yorigumo," the daughter of the railway company president. She's a pampered princess at home, unruly even by her family. Fearless and carefree, she one day, while riding the train, accidentally trips up a metal plate and becomes the target of a group of gropers.

This group of perverted uncles, besides being themselves perverts and social outcasts, also despise pampered young ladies like Tenshi Moe, who seem detached from reality. To teach her about the harsh realities of life, their burning hot penises are the best teaching tool, showing her that in the real world, she has to do everything herself, even when being raped, she has to thrust herself.
In addition, etiquette training is essential. The perverts teach Tenshi Moe, such as saying "Please put your penis in" when begging for penetration. And when the other person climaxes and ejaculates, her body full of filthy semen, she can't forget to say thank you.

Seeing that Tenshi Moe went from initially resisting fiercely to gradually enjoying herself, her expression becoming less tense and her muscles less stiff, finding pleasure in being gang-raped, the perverts knew they were raising a dedicated sex slave. Eventually, they even started a "lewd arms race," seeing who could make Tenshi Moe produce the most fluid.
After a year of this "daily gang rape," Tenshi Moe was on the verge of a physical and mental breakdown. Although it was painful, it was incredibly pleasurable. She said no, but her body said yes—that's roughly the idea.
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