Usotsukitachi no Choushoku

Sato is an office worker who has feelings for his colleague of the same sex, Kimura.
Even though he is married with a wife, Kimura keeps sleeping with Sato.
But then Yamaguchi, a co-worker, finds out about their illicit relationship.
Meanwhile, Kimura's wife grows paranoid about her husband's lack of passion.
Everyone is hiding the truth from each other.

(Source: Fusion Product, translated)

Notes:
- Chapter 1 was previously released as a one-shot under the title "go-to" in the Yomikiri Anthology "Choushoku, Shimashou ka."
- Includes two extra chapters.