An Evil Dragon That was Sealed Away for 3000 Years Became My Friend

*A serialization of the webcomic of the same name.* Youta wanted a friend, so obviously, he magically summoned one. He didn't quite count with the fact that he'd summon Mumu, a mighty and evil dragon girl, notwithstanding that due to hundreds of years of imprisonment, she's very needy, very weepy, very clingy, and lonelier than the button "9" on a microwave oven. *Note: Began commercial serialization in Magazine Pocket on August 4, 2021. Includes one extra and one bonus chapter.*