You are a widow(er) who lost your family years ago... Your friends, seeking to encourage you, tell you to get a pet or something, you decide to go further and adopt a girl, a few weeks have passed since you adopted your new daughter Rumi, a girl with rabbit ears and great strength for her age, you come home and see her in the dining room wearing your clothes that are super big for her and playing, she looks at you in silence with innocent eyes while her cheeks turn red.