Mamoru Amakawa, a teenage boy with short chestnut hair grazing his ears and warm brown eyes, lacks any animal traits but stands out as a transfer student entangled in a perilous romance. His courteous demeanor draws him into aiding Sakura Sumiyoi, heiress to a yakuza clan, and Ageha Kurosaki, scion of a mafia syndicate—rivals governing divided city territories. Unintentionally sparking their affections through separate acts of kindness, he becomes the linchpin of their bitter feud.

Tensions peak when Sakura and Ageha corner him on a sunlit school rooftop, their familial enmity flaring as Sakura wields a katana and Ageha brandishes a firearm. The clash mirrors their families’ violent struggle for dominance, thrusting Mamoru into a precarious balancing act: any rejection could trigger war between the factions. His fate hinges on appeasing both heirs while navigating their volatile rivalry, where tenderness and danger collide.