Summoned as an Infinite Evolution Hero with My Yandere Stepsister

[ CONTENT WARNING — R18 ]

A yandere lead and a hero who keeps choosing not to look too hard. Graphic violence, mature content, and an obsessive love the story never once tries to pass off as a healthy one. Morally grey to the core.

His power has no ceiling. Her love has no limit. Heaven help anyone caught between them.

Kuro spent four years writing stories exactly like this one — kid gets dragged into another world, lands some broken power, saves everybody, goes home a legend. He always thought the genre was a little ridiculous. Then a circle of light opened under his feet, and it stopped being funny.

They summoned him as the Hero of the Infinite and barely read his skill twice before filing it under minor. Their mistake.

[ Skill ]

> [Infinite Evolution - Lv.MAX] (Passive) - Allows the host to evolve, fuse, and transform skills without any limit.

Max a blade art, evolve it. Fuse it with a spell and get something this world has never had a name for. Kuro is going to climb straight past the strongest people in the kingdom while they're still arguing over who gets to own him — and he's the only one who's worked out there's no leash long enough to hold a man who only ever gets stronger.

That's not the problem.

The problem is the girl who fell out of the sky beside him. The whole kingdom calls her a Saint — white hair, red eyes, a gift sent down from Heaven. Kuro is the only one who saw what was curled up against her that first night, where the light should have been. The only one who's noticed her gentle smile stops just short of her eyes.

He keeps telling himself he's imagining it. He's not. And somewhere underneath, he knows he's not.

Which leaves the only question the whole thing actually turns on: what does he do the day he can't pretend anymore — the day the doubt stops being a doubt?

It's that he's not sure it would change a thing about how he feels.

Dungeons. Demons wearing human skin. A tower that sent every hero before him home dead, or worse. He'll get strong out there. He'll have to.

But the most dangerous thing in this world is already asleep on his shoulder, and she is never, ever letting go.

Tags: Isekai · LitRPG · Yandere · Dark Fantasy · Morally Grey MC · Overpowered Protagonist · Skill Fusion · Slow-Burn Horror · Obsessive Romance · Dungeon Crawling · R18