The Devil Is a Part-Timer! Novel Vol. 20 (novel)

Much like her younger sister Acieth, something strnage has startedhappening to AlasRamus. To help their baby girl, Maou convinces thereluctant Emi to travel to herfamily's home in mystical...Eifukucho. There,the Demon King is floored by theluxurious furnishings like a proper alcovefor the doorway, a full-sized refridgerator,and rooms big enough to actuallyspread out.

He better get his bearings soon though,because this marks thestart of him living under one roof with the Hero andtheirdaughter!