Shokatsu Sei competes in the Raten Taishou tournament, commanding mastery of Qimen Dunjia—an ancient strategic art harnessing energy manipulation and environmental control. His signature technique, Qimen Kenzou Shinpou, enables him to dismantle opponents by deciphering energy patterns to anticipate movements and vulnerabilities. Dominating early matches, he breezes through preliminaries and the first round with calculated efficiency.

A pivotal clash arises against Ouya, a fellow Qimen Dunjia practitioner. Their battle contrasts sharply: Shokatsu Sei’s meticulous precision meets Ouya’s Fuukou Qimen, a forbidden branch of the art classified among the eight secret techniques. Fuukou Qimen warps conventional energy dynamics, generating chaotic assaults that defy Shokatsu Sei’s analytical strategies. Determined to unravel its secrets, he risks prolonged engagement, dissecting Ouya’s erratic methods until the gamble culminates in his loss.

Eliminated from the tournament, Shokatsu Sei leaves Ryuukosan but resurfaces during Zensei’s assault on Tenshifu stronghold. Aligning with defenders, he fights alongside former rivals like Ouya and Rikukin to thwart the invasion. Though his exact tactics during the conflict remain undefined, his participation signals clear allegiance to Tenshifu’s cause.