Imitation Love: A Couple's Tribulations

Shinobu and Saki Taura work for Daido Publishing and are a loving married couple. Shinobu is kind and good at his job, making him a popular guy at the office. This has Saki start to worry that he might decide to up and leave her. One day, Shinobu asks if he can go to a blind group date. On top of that, there's someone lurking behind the scenes trying to break the couple up! A friend, a coworker... or maybe even Shinobu? Just who is the traitor?!

(Source: MangaPlaza)