Volume 1: Midnight Conflict
Higa Kousuke, 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...?!

In the series:

Vol. 1: Midnight Conflict
Vol. 2: Midnight Conflict KGS (Kuso Gaki Shuurai)
Vol. 3: Midnight Conflict ACO (Atsushi Coming Out)
Vol. 4: Midnight Conflict DDD (Doki Doki Dousei-hen)
Vol. 5: Midnight Conflict HNW (Hello New World)
Vol. 6: Midnight Conflict OLP (Ofutarisama Life Plan)
Vol. 7: Midnight Conflict THX

Volume 2: Midnight Conflict KGS (Annoying Brat Arrives)

The convenience store worker Higa and the office worker Tatemura are next-door neighbors in the same apartment building, and they constantly fight like cats and dogs.
However, because their bodies are exceptionally compatible, they became sex partners on weekends all the while still bickering...
But one day, Higa finds himself having to shelter an annoying brat at his place...?!