When they were kids, Konoe Moyako and her younger brother Akira had a conversation where he expressed his desire to marry her. Understandably, Moyako interpreted this as her sibling harboring an unhealthy fixation on her. Now that they're teenagers, Moyako is committed to getting her brother the help he needs and dispelling the notion that he has any perverse intentions towards her. However, despite her best efforts, she's unable to view even innocent scenarios without a tint of suspicion.