My One-Hit Kill Sister

異世界ワンターンキル姉さん ～姉同伴の異世界生活はじめました～

Asahi Ikusaba is transported to a fantasy world expecting to thrive on his isekai knowledge, only to find his stats are nearly useless. His older sister Maya follows him there, armed with absurdly overpowered abilities that let her obliterate any enemy in a single hit. Between Maya's smothering protectiveness and Asahi's determination to prove himself, the siblings navigate a world where only one of them actually needs to try.