Kansuke Matsuri operates as a devoted follower within Hinako Shiratori's student faction at Emperor High School, steadfastly opposing Ganpachi Chabane's disciplinary campaigns. He collaborates closely with fellow core members Ryuichi Watanabe and Umekichi, engaging directly in clashes to reinforce Hinako's leadership. Eschewing brute force, his confrontational style emphasizes tactical ingenuity—deploying high-pressure water hoses or manipulating environmental objects like microwaves to gain advantage.

Outspoken and bold, Kansuke vocally challenges adversaries during skirmishes. His actions include coordinated efforts to subvert Ganpachi’s authority, notably attempting to strip the teacher’s layered Lucky Kitty Gym Shorts during a critical humiliation plot against Hinako, though the undergarments resisted removal. His involvement extends beyond school premises, such as joining group defenses during off-campus incidents like a convenience store ambush. Kansuke functions exclusively within collective maneuvers tied to the central conflict, devoid of solo narrative focus.

The character maintains unwavering consistency as part of Hinako’s support unit. No exploration of his background, origins, personal evolution, or expanded history occurs within the documented narrative scope.