Rimi was adopted into the Ono family as a foster daughter during her student years, vowing to dedicate her life to caring for her adoptive father. He had been injured in war and lived with lasting aftereffects requiring constant care. Rimi faithfully performed her duties, never forgetting the debt of gratitude she owed him. However, her temperamental adoptive father tolerated no mistakes, punishing even minor slip-ups with physical discipline. Witnessing this treatment, his biological son one day began reevaluating Rimi's situation, reflecting deeply on everything that had transpired.