Product description ※Please note that product information is not in full comprehensive meaning because of the machine translation.
Rei AOI is a 0 man married couple girl. Her parents were transferred away and her younger brother left home to go to university, so she lived alone at her parents' house. One day, her younger brother Ritsu suddenly comes back. Ritsu is her brother-in-law who was born after her parents remarried, and she says she will "live here again" when she gets a job. Ritsu came back as an "adult man," and Rei gets excited? She's a younger brother, but not a younger brother. She's a fragile, dangerous sister-in-law. Love!