First-year high school student Kyosuke Tatara is shown a video by his swim club friend, Murakami.

It was an intimate video of Kyosuke's girlfriend, Hina Himekawa, with another man (her ex-boyfriend).

Kyosuke suspects the video, leaked by her ex-boyfriend, is revenge porn, but is ultimately confronted with a devastating truth.

Driven into the worst situation of his life, Kyosuke swaps places with his counterpart in a world of reversed chastity following a certain accident.

In the world of reversed chastity, people live lives very similar to those in his original world, with just one difference: the concept of chastity between men and women is inverted.

In that world, Kyosuke meets a girl who looks exactly like Haruna Himekawa, who was his childhood friend in his original world.

Kyosuke is surrounded by many proactive beautiful girls: a glasses-wearing class representative, a Kendo girl, a "gyaru" influencer, an athletic airhead, and a boy who looks just like a girl!

While spending lively days with everyone in the world of reversed chastity, Kyosuke finds himself drawn to Haruna, who resembles his childhood friend.

Will this boy-meets-girl story of mutual crushes come to fruition in the world of reversed chastity!?

And what became of Hina, left behind in the real world?

※The Reversed Chastity World Arc begins in Chapter 11, the True Heroine appears in Chapter 26, Hina's After Story in Chapter 307

The heroine, Haruna Himekawa, replies to comments on the work!?