Summoned as an Infinite Evolution Hero with My Yandere Stepsister

**Content Warning: R18 | Dark Fantasy | Mature Themes** His power has no limits. Her love knows no boundaries. Anyone who stands between them is doomed. Kuro spent four years writing stories about heroes summoned to another world—ordinary people who gained overpowered abilities, defeated evil, and returned home as legends. He always thought those stories were a little over the top. Then it happened to him. Summoned as the **Hero of the Infinite**, Kuro receives a skill the kingdom dismisses as nothing special. **[Infinite Evolution – Lv.MAX]** A passive ability that lets him evolve, fuse, and transform skills without any limit. Master a sword technique? Evolve it. Fuse it with magic? Create abilities the world has never seen before. While kingdoms fight over who gets to control him, Kuro keeps growing stronger, quickly surpassing every warrior and mage in existence. But overwhelming power isn't his biggest problem. The real danger is the mysterious girl summoned alongside him. The kingdom worships her as a Saint—a heavenly beauty with white hair, crimson eyes, and a divine blessing. Yet Kuro is the only one who noticed something hiding beneath that perfect smile. The only one who saw the darkness lurking behind her gentle expression. He tells himself he's imagining it. Deep down, he knows he isn't. As he ventures through deadly dungeons, battles monsters disguised as humans, and challenges the tower that claimed every Hero before him, Kuro grows stronger with every fight. But the greatest threat isn't waiting inside a dungeon. It's the girl resting quietly at his side. Because once she decides someone belongs to her... she never lets them go.