Alternative Titles English: An Evil Dragon That Was Sealed Away for 300 Years Became My Friend (Pre-Serialization) Japanese: 300年封印されし邪龍ちゃんと友達になりました Information Type: Manga Volumes: 1 Chapters: 13 Status: Completed Published: 2019 Genres: Comedy, Fantasy, Slice of Life, Monster Girls Authors: Yaki Tomato Serialization: N/A Synopsis 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.