Oya ga Urusai node Kouhai (♀) to Gisou Kekkon Shitemita.

Summary

Morimoto, a young professional woman in Japan, is tired of fending off her parents' questions about her being single. They want her to marry a man and settle down, and they'll insist on nitpicking her choice of groom to death. In an unexpected move, another woman in the office―who has a crush on her―offers to be her wife in a sham marriage, which might make her parents back off. But this "fake" marriage could unearth something very real! (Source: Seven Seas Entertainment) Included one-shot: Musanso Renai (Anaerobic Love)