Danky Night

Office worker Umesawa's archenemy is a very stubborn and particular man named Hase. They worked together as a team for a joint development, and yet, without a single word, Hase just quit his job, leaving Umesawa seething, unable to forget about him. On a certain night, Umesawa stopped by a bar and was flabbergasted to find Hase there. Despite his cold demeanor, Umesawa was relentless while inebriated. Yet Hase simply dismissed him, "Go home. This is a gay bar."

(Source: Taiyoh Tosho, translated)

Note: Includes a bonus chapter.