Summary
Tatara Kyosuke, a first-year high school student, is shown a video by his friend Murakami, who is also a member of the swim club. It turns out to be a sex tape of Kyosuke's girlfriend, Himekawa Hina, with another man (her ex-boyfriend). Kyosuke suspects it to be revenge porn leaked by Hina's ex, but he is confronted with a devastating truth.
Driven to the worst situation of his life, Kyosuke, due to a certain accident, swaps places with his counterpart in a world where chastity is reversed.
In this chastity-reversed world, people lead similar lives to those in the original world, except for one crucial difference: the concept of chastity between men and women is completely flipped. In this new world, Kyosuke encounters a girl who looks exactly like his childhood friend from the original world, Himekawa Hina.
Surrounded by proactive and beautiful girls, including the glasses-wearing class president, a kendo girl, a gyaru influencer, an all-around sports genius, and a boy who looks like a girl, Kyosuke spends his days in the chastity-reversed world.
As Kyosuke spends time with these new friends and gradually falls for Hina, a girl who is identical to his childhood friend, will their mutual attraction lead to a successful romance?
What happened to Hina, left behind in the real world?
*The chastity-reversed world arc begins in Episode 11. The true heroine appears in Episode 26, and Hina's after-story is told in Episode 307.
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