In a world inhabited by demons and monsters, a small, fragile creature called a human appears every few years, as if reborn from an unknown place. Humans are astonishingly delicate—demon food upsets their stomachs, a slight temperature change makes them ill, and even a minor fall can break their bones. Yet they possess a unique charm: intense loyalty, surprising cleverness, and an endearing quality that no native pet—whether une (dog), nosa (cat), or eshig (rabbit)—can match.

The story begins when a gentle giant demon discovers a lone human in the wilderness and decides to take it home. Despite their intimidating size and appearance, the demon becomes a devoted caretaker, learning through trial and error how to feed, shelter, and comfort the bewildered human. Communication is nearly impossible at first—the human cannot understand the demon’s language, and the two rely on gestures, expressions, and patient repetition to build trust. Over time, a deep cross-species bond develops, shown through daily routines, small kindnesses, and the slow, heartwarming process of understanding each other.

The narrative unfolds as a diary-like record, blending day-to-day life with illustrated ecological notes. Early chapters focus on the first owner’s efforts: figuring out safe foods, creating a comfortable living space, and protecting the human from the harsh, multi-sun world of monsters. The human’s helplessness contrasts with the demon’s strength, but the relationship is never condescending—the demon respects the human’s individuality and comes to treasure its presence as more than just a pet.

Later arcs expand the world by introducing other humans and their owners. Volume 2 shows a gathering of different owners who share tips, struggles, and the joy of raising humans, while the humans themselves secretly discuss escape. Volume 3 introduces a new type of human called Bushi, who is stubborn, hot-tempered, and armed with a weapon that slashes at anyone who tries to touch him. A new owner named Fufu must find a way to earn Bushi’s trust—a challenge that differs greatly from the first human’s gentle nature. Volume 4 presents more variety among individual humans, including allergies, oddly specific preferences, and a stubborn sense of pride, reinforcing the central message that each human is unique and requires patient, respectful care.

Overall, the series is a warm, slice-of-life fantasy that reverses the usual pet-owner dynamic, exploring what it means to care for a vulnerable being from a completely different species. It highlights themes of compassion, communication across barriers, and the quiet rewards of building a relationship with someone who cannot initially understand you.