Living under the same roof as the Demon Lord

Meet Subaru Taneshima. A high school student that lives alone in his apartment however one day as he was about to enter his apartment he suddenly heard a noise coming from the other side of his door. He swiftly inserted his apartment keys into the door and stepped inside, only to find himself face-to-face with a cute demon lord!? Little did Subaru know that this encounter would mark the beginning of his new life. "Human, You shall become one of my servants!" "As if! You stupid demon lord!"