An Evil Dragon That Was Sealed Away for 300 Years Became My Friend (Pre-serialization)

*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.*

Yuuto Kuroma, a 14-year-old with a serious case of chuunibyou, accidentally summons the ultimate Dragon King using a magic circle he had doodled purely on a whim… (Wait, seriously?) On top of that, due to certain circumstances, Yuuto ends up becoming friends with a lonely evil dragon girl who had been sealed away for 3000 years…! (Source: Ichijinsha, translated)