An Evil Dragon That Was Sealed Away for 300 Years Became My Friend

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 "9" button on a microwave oven.

Chapters 1-13 are unchanged from pre-serialization and are not mirrored here.