It has been serialized in Kodansha's seinen manga magazine Morning Two [ja] since July 2016, with its chapters collected in 13 tankōbon volumes as of February 2024.

Because rune magic can be effectively made by everyone, the Assembly carefully watches over any abuse of it, even going so far as to erase the memories of any uninitiated (called "Outsiders") when they discover this secret.

Their name comes from their hats which have long brims or other ornaments to cover their faces, as opposed to the Pointed Caps, whose cap-brims are pinned up.

Some members like Iguin and Sasaran express an interest in having Coco become a practitioner of forbidden magic, claiming to be a "child of hope".

The Witches' Assembly (魔女の集会, Majo no Shūkai) is the institution in Coco's world which governs the use of magic, its spreading (by regulating the enlistment and advancement of apprentices) and the maintenance of its secrecy.

The seat of the Assembly is located in an underwater city called the Great Hall, which can only be reached by a certain stairwell descending into the depths of the earth, as well as special magic.

This community is financed by the Five Kingdoms of the Zozah Peninsula, in exchange for freely serving the people in times of great need.

Also known as the Order of Moral Spellcasting, the Knights Moralis (魔警騎士団, Makei Kishi-dan) is a subsidiary agency to the Assembly—specifically, its law enforcement branch.

Written and illustrated by Kamome Shirahama, Witch Hat Atelier started in Kodansha's seinen manga magazine Morning Two [ja] on July 22, 2016.

[8] A spin-off manga series by Hiromi Satō, titled Witch Hat Atelier Kitchen, started in Morning Two on November 22, 2019.

Silverman praised the series for its world, story, characters and artwork, and concluded that "this is one tale you don't want to miss".

[82] American animator Dana Terrace endorsed the manga series on her Twitter account after receiving fan art from Shirahama of her recently-concluded animated series The Owl House, describing Witch Hat Atelier as a "magical, queer, heart-racing story of empathy and self discovery".