KILLER+SITTER

The battlefields of the world once knew him by a single, chilling name—a mercenary whose lethality was the stuff of legend. But that life is over. Now, under the assumed identity of Ryuusei Nogawa, this former killing machine has slipped into the quiet obscurity of Japan with a mission so bizarre it borders on the absurd: raising a baby. For a man forged in fire and blood, the mundane chaos of childcare is an entirely new kind of war. From mastering the art of formula preparation to deciphering a toddler's inscrutable cries, Nogawa finds himself utterly outmatched by a tiny, mischievous girl named Hoshina-chan. Yet old habits die hard, and in Nogawa's world, danger is a constant companion. As he fumbles through parenting manuals and sleep-deprived nights, he quickly learns that protecting his charge requires more than just brute force—it requires finesse. Any threat, no matter how mundane or menacing, must be neutralized swiftly and, crucially, within the bounds of the law. Whether it's a shady figure lurking near the playground or a more overt enemy from his past, Nogawa applies his deadly skills with surgical precision, all while maintaining the facade of an ordinary caretaker. This is no longer a life of open warfare, but a delicate balancing act between ruthless efficiency and tender care. KILLER+SITTER unfolds as a heartwarming yet high-stakes slice-of-life drama, where the strongest man on earth faces his greatest challenge yet: ensuring that Hoshina-chan grows up safe, happy, and blissfully unaware of the monster who now changes her diapers.