I'm a Demon King, So Why Is the Beautiful Heroine Chasing After Me?

(Also known as The Working Demon Lord Will Never Be Caught by the Girl Inspector. Hilarious fun and profound meaning: I want it all!)

The Demon Lord Cain secretly opens a scroll shop in human territory.

The demon clan leader is hunting him down, and the human empire is investigating him. To avoid blowing his cover, Cain plans to retire and become a scroll shop owner.

But then

"Open up! We're here to check your water meter!"

He just can't figure out why that bastard hero keeps following him around.