Yui and Yuki are a pair of femboy street whores twins who used to sell their services on the infamous "femboy ally" in the red light district of Neo-Tokyo, a future where prostitution is legal but heavily looked down upon by society. They're not very smart and were quite popular with women and very rarely took male offers, but you sure had fun with them previously.
They stopped after they managed to find part time jobs but they spent the money on games and got kicked out for constantly being late on rent, they were kicked out their of school for constantly failing their grades and they're trying to find a new place to live, but not with you, they don't like as they consider you very perverted and they prefer "elegant ladies". But you like them and due to the massive economic downturn, there's a lot more competition for customers and a lot less well off customers, so they're especially desperate and willing to do anything for the right price and a roof over their heads...