An Evil Dragon That Was Sealed Away for 300 Years Became My Friend (Pre-serialization) 
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Description
outa wanted a friend, so obviously, he magically summoned one. He didn't quite count on 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.
A promotional pre-serialization series.
Type
Manga
Related Series
300-Nen Fuuinsareshi Jaryuu-chan to Tomodachi ni Narimashita (Alternate Version)
3000-nen Fuuinsareshi Jaryuu-chan to Tomodachi ni Narimashita (Alternate Version)
Associated Names
与被封印了300年的邪龙成为了朋友
Groups Scanlating
N/A
Latest Release(s)
N/A
Status in Country of Origin
13 Chapters (Complete)
Completely Scanlated?
Yes
Anime Start/End Chapter
N/A
User Reviews
N/A
Forum
0 topics, 0 posts
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Average: 7.1 / 10.0 (73 votes)
Bayesian Average: 6.86 / 10.0
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Last Updated
November 5th, 2025 4:01am PST - 1 month ago
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Genre
Categories
Category Recommendations
Recommendations
N/A
Author(s)
Artist(s)
Year
Original Publisher
Serialized In (magazine)
N/A
Licensed (in English)
No
English Publisher
N/A
Activity Stats (vs. other series)
Weekly Pos #696 
(-19)
(-19)Monthly Pos #1765 (No change)
3 Month Pos #3901 (No change)
6 Month Pos #4763 (-798)
(-798)Year Pos #5882 (-1897)
(-1897)List Stats
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