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Meet the demon lord who prides himself on despising humans, living a solitary life in his dark castle until his routine is upended by Nico, an innocent human girl who wanders into his domain. Despite his initial reluctance and grumbling about his disdain for mankind, this grumpy demon lord finds himself in the unexpected role of guardian. Nico, full of curiosity and resilience, forces the demon lord to confront his own contradictions as he begrudgingly teaches her the ways of survival in a world filled with magical creatures and dangers. Through their daily interactions, Nico's cheerful spirit begins to chip away at the demon lord's cold exterior, leading to a unique bond where each learns from the other.