AntiMagic Academy “The 35th Test Platoon” - Volume 9, Chapter 1 - Fragment of a Mythological World

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This place wasn't as robust as Inquisition's underground facility nor its security was strict. For a highest priority facility that confined special fantastical organisms, it was too vulnerable.

It's been known for a few months already just how hazardous Hyakki Yakou was.

Mankind should have learned from that abominable incident that swallowed an entire section of a city. The fantastical organism that was of highest priority when it comes to extermination, "Hyakki Yakou" was ...