Kazoku Gokko.

From [Midnight Scans](https://www.mangaupdates.com/groups.html?id=1953): As a 15 year old without any relatives, Mei's dream is to save up money and have her own house. She successfully applies for the position of the Tachibana House's eldest daughter of a pseudofamily game, which seeks family members. For one year only a family of 5, who are absolute strangers, will live together under one roof?!