Karin, a younger sister who tends to be a recluse and has a brocon. Worried about her future, her brother thinks about his sister's sake and suggests that she try to interact with other people on a dating app. Karin gathers up the courage to meet a man, but unfortunately she is tricked by a scumbag. The brother, who has hurt his precious sister, vows to never let Karin go, and the two console each other as if to confirm their bond.
