If you're looking for manga similar to Okaasan Futari Itemo Ii kana!?, you might like these titles.
Koike, having come to Tokyo for a job, finds herself renting space in a share house and meeting Makimura. Makimura Asako, former Miss Japan finalist and TV personality, comes out to her housemates and they just sort of all get over themselves.
As a gay couple living in Japan (where gay marriage is not yet legal), Yuta and Kyota have found a unique loophole in order to live together and support one another financially, legally and medically; Kyota adopted Yuta. This nonfiction manga depicts how they met, living together, discussions with their parents, and their future anxieties and determination as they strive for independence and equal rights under Japanese law.