17-year-old Miko is heartbroken to learn her family must move so her parents can take over her grandparents’ inn. She doesn’t want to leave her school or break the promise she made with her friends to graduate together. Luckily, her uncle offers her a room in his share house, within commuting distance.

The house has five other residents, including 29-year-old Matsunaga—a talented but blunt freelance designer who left a major firm over creative differences. Though he seems cold at first, Matsunaga is deeply caring. Trusted by Miko’s mother to look after her, he initially sees her only as a responsibility. But as he watches Miko face challenges with quiet strength, he begins to see her as more than just a high school girl.

Miko, too, finds herself drawn to Matsunaga’s serious nature, rare smiles, and passion for his work. Just as their feelings begin to deepen, Matsunaga’s ex-girlfriend reappears—forcing him to confront the complexity of loving someone ten years younger.

A tender romance unfolds in everyday moments, where two lives slowly intertwine despite the years between them.