Kyo Aguri, a classmate of Sena Izumi at Koua Academy—a prestigious institution training Japan’s future leaders—finds himself embroiled in a shadowy web of unexplained student suicides and clandestine experiments. As a member of the covert assassin group Weiss, he joins forces with Sena and seasoned operatives Aya, Ken, Yoji, and Omi to dismantle the dark forces corrupting the academy, targeting Epitaph, the architect behind the tragedies.

Kyo’s alliance with Weiss is driven by a personal connection to the academy’s escalating horrors, though the precise origins of his vendetta remain undisclosed. This aligns with Weiss’ broader narrative of vengeance-fueled members pursuing justice through lethal means.

Within Kritiker’s animal-themed codename system, he is designated “Havana Brown,” a title absent from anime references but integral to his covert identity. His persona is further intertwined with yellow roses, a recurring floral motif symbolizing his enigmatic role within the team’s thematic tapestry.