That time I quit being a demon lord and become an adventurer instead

In the world of Linaria, kingdoms all across the world has summoned their heroes to face the demon lord who has reawakened this time. However.... The reawakened Demon lord in question..... Is a tired office worker who is done facing troubles like explaining to his higher ups or facing brats who can only swing a stick after being drunk in a local pub. Hence....the world of Linaria became peaceful due to his retirement upon arrival. P.S. This is not a harem story, I repeat, this is not a harem story. It’s just the protagonist way of having fun in an another world after being forcefully reincarnated as a demon lord.