Whimsical Master and Part-Time Butler

Ao Osawa, a fresh graduate, was hit by a harsh reality on his first day at work. The company he worked for went bankrupt. Unable to return to his parents' home due to certain circumstances, he decided to look for a job as a live-in worker. Suddenly, he is approached by an elegant old gentleman.
Are you interested in a job as a butler?
Ao follows the invitation and goes to a mansion for an interview. There, he finds a beautiful and elegant but somewhat listless-looking master...

(Source: Kadokawa, translated)