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When the boss of an assassin organization suddenly dies, a battle erupts for the "List of the Dead" he left behind. The List of the Dead is a client list detailing who has assassinated whom, a list that could potentially change the course of world affairs. Only the boss's son, Mitsuya (4 years old), knows its location. Asahi and Taka, former loyal subordinates of the boss, devise a plan to win Mitsuya over by living with him as a makeshift family, but... these two actually hate each other. Furthermore, having entered the assassin world at a young age, they don't know what normal life is like. From Mitsuya's refusal to change clothes and his picky eating habits to neighborhood troubles...? Normal life is harder than assassination... World peace rests on a 4-year-old. Can these two assassins complete this mission!? (Source: Shueisha, translated)