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 button "9" on a microwave oven.
Chapters 1-13 are unchanged from pre-serialization and are not mirrored here.