Magaku No VarmutMagaku no Varmut; 魔託のヴァルムト; Mataku no Vermut; The Devil's Babysitter

My name is Varmut. I am the gatekeeper of the Demon King's castle. What the hell happened to that brave hero guy? He didn't show up today either... hmm? The brave guy didn't show up, so I was transferred to the day-care center! What's that? Hey!