Often mistaken for a doll, the Hybrid Child is a toy capable of adapting human abilities, ranging from reading books to conveying emotions. Its capabilities depend on the level of affection its owner provides. Nurture it with the best affection, and the model will flourish. Having been together for 10 years, the slothful Kotarou Izumi believes that Hazuki—a Hybrid Child he owns—will remain in his life forever. However, everything falls apart when the artificial human suddenly collapses. Hybrid Child portrays the struggles of Hybrid Children and their owners through three brief narratives.