300-nen Fuuin Sareshi Jaryuu-chan to Tomodachi ni Narimashita

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.