Humans and their contraband will inevitably corrupt the Magical World. That's an indisputable truth that Siomar, one of the Amicaters trusted to guard the border between worlds, has known his entire life. But his beliefs are challenged when he is sent to investigate a suspected human hiding at a mana spring resort. His devotion to his job will tangle him in an Enchanter's quest for revenge, while he discovers there's more to a human girl than meets the eye.