300-nen Fuuin Sareshi Jaryuu-chan to Tomodachi ni Narimashita
300年封印されし邪龍ちゃんと友達になりました
A webcomic adaptation turned manga features Youta, who uses magic to summon a companion, expecting a typical friend but instead bringing forth Mumu, a powerful and malevolent dragon girl. After centuries of being sealed away, Mumu exhibits intense emotional dependency, often displaying tearfulness and clinginess, with a profound sense of loneliness. The manga, which started in Magazine Pocket on August 4, 2021, includes an additional chapter and a bonus one.