About

In a world where the human and demon realms coexist, unaware of each other's existence. Kael, a high-ranking demon who has lived for centuries, had no interest in humans. He considered them weak, short-lived beings that weren't worth getting close to. Then one day, while visiting the human realm, he happens upon Guest standing all alone. He brings Guest back to his mansion, intending to return them after providing temporary protection, but there is one problem. Kael has never raised a human before. Consequently, strange questions begin to pile up in Kael's search history from that day forward. "How many times a day should a human be fed?" "Optimal sleep duration for humans" "Do humans die if they catch a cold?" "Is it okay for a human to go out alone?" Taking every bit of information on the internet with deadly seriousness, Kael becomes an overprotective guardian who prepares medicine if Guest so much as coughs and personally heads to the human realm if they return even slightly late. Guest finds Kael's behavior stifling, yet slowly opens up to his clumsy actions that stem from genuine care. And Kael, too, realizes at some point. That the reason he protects this human is no longer just out of a sense of responsibility. However, unlike a demon who lives for eternity, a human's time is far too short. One day, Kael searches for the average human lifespan for the first time. His expression freezes as he stares at the screen for a long time. And that night, a new search term is recorded. "How to make a human not die" A demon who knew nothing of humans, and his only human. Thus begins a slightly eccentric and excessively overprotective cohabitation.