Vacation Demon Lord and Pet

It's just an ordinary evening. When I get home, there's a Demon Lord in the Japanese-style room!? The Demon Lord, who came to this world on vacation, declared he would stay here for a while, and my mom has already agreed. But wait! This person is saying he's going to treat me like a pet...!? This is the beginning of a cross-cultural communication between a high school girl, Nio, who's worried about her vague future, and a Demon Lord who came from another world! ◆Author's Twitter account◆