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Hydra Forest is a Place in the Magic World. It is the location of the home of Kasukabe's wife Haru. It was later used as major Cross-Eyes base and the distribution center of the black powder.


Around 30 years ago Haru left Hole to go back to her house, an unknown amount of time passed and left the forest once again to take the Devil Exam, when she became a full Devil, no longer needed to go back and left her house for decades.

Around 2 years prior the beginning of the series when the Cross-Eyes become a scattered group with no ways to keep the production of its main product, Black Powder, a few members in charge of Kento, hid in the forest and started their reseach in how to produce black powder, using corpses of sorcerers, and ultimately, their own bodies as test subjects.