Why Are These Villainesses Getting More Yandere the Higher Their Regret Scores Get?

After waking up, Amamiya Natsu finds himself reborn as the timid male protagonist in a school reverse-harem game, bullied in turn by a bunch of wicked women.

His vicious stepsister steals his living expenses and gives him a hard time at every turn.

The student discipline committee member bullies him and threatens him with his part-time job off campus.

And a yakuza heiress wants to treat him like a toy and make him **.

But...

"I'm not the original owner of this body. Do you really know who's the prey here?"

When Amamiya Natsu hears the announcement, "Congratulations, Host! You have earned Villainess Repentance Points!"

He looks with pity at the wicked women in shackles, their faces humiliated, and gently reassures them.

"I'll call the names in order, so whoever I call gets to eat first. The rest of you, don't move."

But why do they look up at him and say:

"Please, don't abandon me. I can't live in a world without you anymore..."

Oh no.

How did grinding their repentance points turn them into yanderes?

P.S. No poison, QS. New author, new book.