Daisū, a manga creator raised in an orphanage, endured a childhood defined by isolation and the absence of family. Though a grandmother figure at the orphanage assured him he wasn't alone, profound loneliness permeated his early years. Professionally, he struggles as his manga fails to sell, leading to financial instability where monthly manuscript deadlines dictate his living expenses. This professional hardship contributes to his solitary and monotonous daily existence.

His life transforms completely when he meets Myō, a cat-eared teenager, during a rainstorm and brings the boy home. This encounter reveals the existence of "Ear People," the supernatural race Myō belongs to. As Myō becomes his roommate, Daisū assumes a caretaker role. He navigates the younger boy's tendency for daily mischief and trouble while also concealing Myō's visible cat ears and tail from public scrutiny. This responsibility shifts Daisū's routine from isolated boredom to active engagement, demanding patience as he guides Myō through human world norms like marketplace behavior and household chores.

Emotionally, Daisū evolves from detached loneliness to experiencing deep interpersonal warmth for the first time. He openly expresses appreciation for shared moments of happiness with Myō, such as discovering a large tree on an outing or collaborating on meals. Protective instincts surface strongly when Myō feels insecure about his usefulness, prompting Daisū to reassure him of his inherent value. This relationship helps Daisū process his orphaned past, leading him to confide in his orphanage grandmother about finding companionship; she offers support regardless of gender. Daisū internally acknowledges this emotional shift as akin to "standing in sunshine," contrasting sharply with his prior solitude.

Deeper dimensions emerge through interactions beyond Myō, including managing professional pressures from his editor, Jinzhu, and navigating complex dynamics within Myō's non-biological family, such as with Myō's brother figure, Dong Xia. Daisū's defining trait becomes his willingness to reshape his life around Myō's needs, prioritizing the cat-eared boy's well-being. This evolving relationship gradually reveals layers of Daisū's capacity for affection and commitment, fundamentally reshaping his identity from a solitary artist to someone anchored in a newfound familial bond.