僕の幸せ≠彼女の幸せ

Normal, run-of-the-mill salaryman Tadashi and his wife Yahiro are happily married.

Well, they were, until Yahiro told him about an ex of hers. Now he's suspicious that she's having an affair. But right as his worries started to boil over, his work handed him a huge new assignment -- meeting with the young CEO of one of their closest business partners!

[From DLsite]