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The "hero" basically the op dude, totally knew they were yanderes and stuff.
As a perfect guy, he didnt dislike or hate them but was not his "strike zone". So he wasnt interested in them.

So he prepared a back-up plan that after beating demon-king, a summon magic circle that will send his soul in other worlds and switch with someone (with a decent life prerequisite factor).

MC then is in hero's body.
And even "cursed" to not able to reveal he is not "him". (Hero leaving a letter giving explanations in a happy smile ciao style)

MC is not useless as hero's body is still decently OP and knew the game/book's skills. But can only use 10% strength.

So you see MC use any means, especially despicable ones, like a slime pool trap, to stop the chasing heroines.
Meanwhile the world at peace (and no evil church or kings) are smiling and laughing seeing Hero and Heroines appear around the world.
Not knowing they are having secret fights in plain sight (John Wick metro scene style).

End.

Sounds like a good idea to me.

A good short story idea might write sometime-nya