Chi no Tsunagaranai Watashitachi ga Kazoku ni Naru Tatta Hitotsu no Houhou

His step-sister Erika, whom he reunites with for the first time in seven years after their divorced parents reconciled with each other, and his childhood friend Mio, who feels like a close male friend to him despite being a girl. Katsuragi Shota ends up living under the same roof with the two of...

Source: MyAnimeList