There's a Demon Lord on the Floor manga volume 2 features story by Hato and art by Masaki Kawakami.

“Heh heh! Welcome to our feast of blood and flesh. Are you ready to order?”

So, the girl who showed up to interview for a job turned out to be a ravenous Demon Lord! And now she’s joined by this psycho blonde shrine maiden… we’re so toast… Sit. Eat. TRANSFORM! A Demon Lord and a family restaurant dish up the second course of this new comedy sensation!