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

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.

[A serialization now exists](https://mangadex.org/title/ff09caa3-a990-4dff-a22f-d33d9be38f1c/300-nen-fuuinsareshi-jaryuu-chan-to-tomodachi-ni-narimashita), though the chapter numbering is not straightforward.

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Twitter raws can be found in the URL below. Pixiv raws (which update after the Twitter release) can be found [here](https://www.pixiv.net/user/13651304/series/70185).

Buy the book here:

[Melonbooks](https://www.melonbooks.co.jp/detail/detail.php?product_id=699033)

[Toranoana](https://ecs.toranoana.jp/tora/ec/item/040030845366/)