Alternative Titles
English: An Evil Dragon That Was Sealed Away for 300 Years Became My Friend
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: 2
Chapters: 32
Status: Cancelled
Published: 2021
Genres: Comedy, Fantasy, Slice of Life, Monster Girls
Authors: Yaki Tomato
Serialization: Weekly Shounen Magazine

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.

Note: This serialized run of the manga continues from the pre-serialized one.