Midnight Conflict

Kousuke Higa, a gay convenience store worker, has a nemesis. It's the unpleasant office worker who always comes in late at night, Tatemura. Higa longs for the comfort of a lover to relieve his daily stress, so Tatemura, who picks fights with him, is the bane of his existence. Higa finds Tatemura to be insufferable and incompatible with him, yet when his gay friend introduces him to a nice guy, he ends up finding himself face-to-face with none other than Tatemura...! The two reached their annoyance with each other to the limit, and in order to blow off some steam, they have sex with no holds barred, but then...?!

(Source: Kadokawa, translated)

Volume 1: Midnight Conflict
Volume 2: Midnight Conflict KGS
Volume 3: Midnight Conflict ACO
Volume 4: Midnight Conflict DDD
Volume 5: Midnight Conflict HNW
Volume 6: Midnight Conflict OLP
Volume 7: Midnight Conflict THX