From MangaHelpers:
Just as he lost his job as a waiter and almost became homeless, Soji got picked up by a sexy and kind woman. She took him to her very expensive looking apartment for the night. What he realized later was that this apartment complex was owned by the girl he grew up with, Hanayo. In this apartment, the residents (all female), in return for not having to pay rent, can not bring men to the apartment and have to wear cosplay all the time. Now Soji is trapped in this all-female cosplay heaven: Otomezon.