A boy named On, gentle to the point of never having felt anger, becomes a butler at the Hakaori household to pay off his deadbeat father’s debts. The Hakaori family is an ultra-wealthy dynasty locked in a ruthless succession war where seven candidates compete for the position of family head. On’s young master, Hibiki Rō, possesses a supernatural ability that weaponizes wrath: his power feeds on anger, turning it into raw combat force. Contrary to ability logic, On’s complete lack of anger makes him immune to Hibiki Rō’s power, and the two form an unlikely bond as On proves himself not through subservience but through a genuine desire to be Hibiki Rō’s friend. Hibiki Rō’s wrath ability is tied to a physical “switch” or seal; once On helps him unlock full control over it, they become a formidable team. Their first major test comes against a rival butler named Kiyoko, a woman whose power embodies gluttony: she can consume anything inside a target’s stomach, instantly incapacitating them. On and Hibiki Rō must master their synergy to overcome her. The larger conflict unfolds as the seven candidates and their butlers clash in a series of battles, each powered by a distinct vice such as gluttony, pride, greed, and sloth, all mapped to supernatural abilities. Midway through the story, the proud pair Shishimaru and Hayase emerge, kidnapping the maid Nagisa Yui to provoke a rival candidate and triggering a three-way battle between pride, greed, and wrath. As the war escalates, the top-ranked candidate, Higa, is possessed mid-combat by a malevolent entity that whispers for him to grow stronger and gather more seals. This entity is revealed to be the true darkness buried within the Hakaori bloodline, a hidden force manipulating the succession battle from behind the scenes. In the final volume, the other candidates and butlers, with On at the center, unite to end the conflict and confront this inherited evil, bringing the supernatural succession war to its conclusion. The setting is the sprawling, closed-world estate of the Hakaori family, a domain where every corridor and chamber can become a battlefield. The story’s narrative arc moves from On’s recruitment and his first awakening of power, through one-on-one butler duels representing each sin, and into a final conspiracy-driven confrontation that recasts the entire succession contest as a front for a far older and darker force.