こすちゅーむ☆ぷれいやー

There’s both a male and female perspective to play in this game.

The guy is very much the otaku, but his social rank is elevated very much so when he finds a girl looking for a place to live. He agrees to help her out and the two of them start living together (much to dismay of his other--few--lady acquaintances). 

On the girl’s side; she’s trying to escape from a not-so-desired family situation. She finds a nice guy who lets her stay at his place. Perhaps out of compensation (or curiosity), she decides to help him out by cos-playing for him at the various conventions and stores he goes to. She doesn’t mind, she aspires to be a net-idol.