Minato, a quiet college student, has an unusual part-time job. Every night at the stroke of midnight, he tends to a dreamy, sleepy bunny girl who returns home like clockwork. Her name is Miyuki—eight years his senior, alluring, whimsical... and not related by blood, despite living under the same roof. Once a sister, now something more—and less. She wears her bunny ears not for show, but as a veil between waking life and a half-forgotten dream. And Minato? He simply helps her unwind, spoil her a little, and gently tuck her in for the night. This is the story of a not-quite-family, not-quite-strangers pair, and the quiet warmth they share in the hours between dusk and dawn.