[Demon Slayer: Giyu X Rengoku] After the Breakup, the Two Rengokus Switched Bodies

Two male leads. An atypical ABO setting, with a modern-day purgatory and a System. The couples are UzuRen in Demon Slayer Academy and GiyuRen in the Taisho era, more or less.

[Currently revising...]

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After a heated argument, Rengoku Kyojuro and Uzui Tengen broke up.

Overcome with grief, Rengoku Kyojuro passed out at an intersection because of his heat. When he woke up, he found himself in the Taisho era, and Tomioka Giyu had marked him!

Rengoku Kyojuro: !

Tomioka Giyu: ?

The crow hidden in the shadows: Quietly taking all the credit.

Uzui Tengen and Rengoku Kyojuro had broken up.

In the end, he didn't go to Rengoku right away to ask him to get back together. Instead, like a coward, he secretly kept tabs on him.

Rengoku was still the same: sunny, cheerful, passionate, and upright. If anything, his appetite seemed even bigger. He looked as though the breakup hadn't affected him at all.

One day, Uzui Tengen couldn't take it any longer. He stopped Rengoku after school, greedily breathing in the scent of his neck and repeatedly saying, "I'm sorry." But Rengoku shoved him away.

"What are you doing, Uzui?"

Meeting Rengoku's confused gaze, tinged with disapproval, Uzui Tengen opened his mouth, but all he managed to say was, "Rengoku, where's your gland?"

Theme: A bittersweet romance.