In a single cataclysmic moment, an alien entity called the World Core reboots the planet, killing most life and reconstructing survivors inside a game-like environment where Chi energy and combat levels determine who lives. Our protagonist, a martial artist with a unique Chi-borrowing skill, emerges as one of the few humans capable of thriving in this new brutal reality — and quickly discovers that survival requires both fighting mastery and cultivating intimate bonds with powerful women.

A pragmatic, combat-experienced martial artist who adapts quickly to the new Chi-driven world. His defining skill — absorbing and temporarily borrowing others' abilities through intimacy — makes him simultaneously the lynchpin of his party and a controversial figure, but reviewers find him likable and grounded rather than a blank power fantasy vessel.

Across three books, the series moves from the shock of apocalypse and first survival battles through escalating trials set by the World Core itself, culminating in a global tournament against the most powerful competitors left alive. The hero grows his Chi abilities toward truly OP levels while his party of women each develop their own unique powers — but even victory in the final tournament comes at a price the group doesn't fully anticipate.