TV-Series
Description
Kannei Kouha is a student of Nanyo Academy and a member of the school's most elite fighters, known as the Big Four. He serves as the successor to the ancient warrior Gan Ning. Physically, he is characterized by his short brown hair, tanned skin, and a stubbled jawline, typically dressed in an orange hoodie. His primary weapons are a pair of tonfa, which in some versions are said to conceal blades within them.

Before the events of the story, Kannei was known as a kind person who enjoyed fighting but was fundamentally unable to take a life. He is manipulated by his fellow student and Big Four member, the schemer Saji Genpou, who forces him to assassinate Enjutsu, the absent leader of Nanyo Academy. The trauma of committing this murder drives Kannei insane. His subsequent actions are heavily influenced by Saji, who uses hypnosis to make Kannei believe Enjutsu is still alive and to follow a series of violent orders. In this deranged state, his personality becomes characterized by an aggressive, animalistic, and suicidal ferocity, earning him descriptions that liken his behavior to that of a crazed animal.

Motivated by the false imperial orders fed to him by Saji, Kannei is tasked with eliminating the series' protagonist, Hakufu Sonsaku, who is seen as a threat. He pursues this goal with relentless violence. In combat, he initially overpowers Hakufu, demonstrating superior speed and skill, but he is ultimately stopped by her protector, Shimei Ryomou, who beats him unconscious with his own weapon. He remains a persistent antagonist, later ambushing Hakufu and her cousin Koukin Shuyu, breaking Koukin's arm during the fight before being driven off by a more powerful Hakufu. His role in the story is that of a tragic pawn and a formidable but unstable obstacle for the main characters to overcome, representing the manipulative and destructive schemes within Nanyo Academy.

Key relationships define his arc. He is a tool for Saji Genpou, who uses and discards him without regard for his well-being. He is an enemy to Hakufu Sonsaku and her cousin Koukin Shuyu, whom he attacks on multiple occasions. He also acts as a direct rival to Shimei Ryomou, who is both a fellow member of the Big Four and the person who repeatedly defeats him in combat. Over the course of the first anime series, Kannei shows little positive development, instead descending further into madness as he is manipulated and defeated. His story concludes with him being confined to a mental institution as a result of the insanity inflicted upon him by Saji. At this rank, he is classified as a B-Rank Toushi, though his unstable nature makes him dangerous regardless of formal rankings. His notable abilities lie in his physical martial arts prowess, specifically his ambidextrous skill with his twin tonfa, which allows him to deliver rapid and powerful strikes that can overwhelm even skilled fighters in close quarters.