Kai flips a switch and becomes someone else entirely, a killing machine that solves problems the gentle version of him never could. That duality isn't a gimmick; it's the entire point, and the OVA burns through two episodes asking whether the real Kai is the one who cares or the one who destroys. By the end, you're not sure which half of him you were rooting for.
Kai and Haru are freshly recruited agents at Japan's Narcotic Control Department, thrust into a gritty world of crime syndicates and cutthroat criminals. On the surface, Kai appears gentle and introspective, carrying invisible scars from his past. But something switches inside him when violence erupts. The moment danger peaks, his entire demeanor transforms into something primal and lethal, a complete inversion of his quiet nature. Haru watches his partner oscillate between two vastly different people, unsettled by the Jekyll-and-Hyde shifts yet reliant on Kai's devastating prowess in combat. As they navigate increasingly dangerous cases involving drug trafficking and organized crime, the mystery of Kai's fractured psyche deepens. What trauma fractured him this way? Why does he shift so violently between states? The answers buried in Kai's history begin surfacing, each revelation complicating what it means to be human when violence becomes your most authentic self. This compact story combines hard-edged action with genuine psychological intrigue, asking whether a weapon can ever truly be disarmed.