(from ebookjapan):

The manga depicts the tragic and joyous life of Takashi Shiki, a no-good man known as "Dimbulb," as he goes about his life as a company employee.

He first arrives at K.K. in a cab late at night for the company initiation ceremony the next day, but arrives too early and drinks at an oden stall near the company.

He then goes to greet a senior employee who was on duty, and witnesses the employee having sex with a woman...?