Kowagari Danshi wo Abakitai

Every night when he comes home, system engineer Ioka finds himself getting hassled by his next-door neighbor, Kuga, a rough-looking guy who keeps insisting, “C’mon, let me hang out at your place!” Ioka has maintained his peace of mind by simply ignoring him, but one day, Kuga unexpectedly apologizes, saying, “Sorry... you’re probably tired and I’ve been too loud.” The glimpse of his straightforward side leaves Ioka surprised. Later, through the course of conversation, Ioka ends up going over to Kuga’s apartment, where he stumbles upon a secret of his...!?

(Source: Cmoa, translated)

Note: Includes one extra chapter.