Laying Low in the Celestial Prison and Signing In: Every Female Prisoner Is Love-Struck

Lu Changyuan transmigrates into a fantasy world, where he becomes a lowly, overworked prison guard in the Nine Nether Heavenly Prison and binds himself to an Invincible Sign-In System.

The prison’s deepest cells hold ruthless, peerless female emperors, yandere demon lords, and princesses whose kingdoms have fallen.

To earn sign-in rewards and grow stronger, Lu Changyuan is forced to spend his days “taking care of” these fearsome women.

“Prison Guard Lu, help suppress the ice poison in my body, and I’ll make you emperor.” The aloof female emperor slips off her robe.

“Brother Changyuan, I already wiped out the whole family of the warden who docked your pay. Praise me!” The yandere demon lord clings to his leg, begging for approval.

Lu Changyuan is on the verge of a breakdown. I just want to keep my head down and collect sign-in rewards. Why do I have to help you suppress your backlash during the day, then stay up making chicken soup and providing counseling at night?

Then one day, an army of villains storms the imperial capital and charges into the prison.

They think they’ll rescue the demon women, but instead see the unremarkable little guard sweep away an army of a hundred thousand with a single stroke of his broom.

“You’re so noisy. Can’t you see they’re lining up for dinner?”