Want to Go Back But Can't

The Zyumans cannot return to Zyuland until they find the missing King's Credentials. Amu thinks she has found it and takes Yamato along with her, but she seems more interested in experiencing human culture. Their plan gets cancelled thanks to a Deathgalien Player Bowguns's attack. His attacks are too fast to be seen, until Yamato seems to unlock a new power.

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S40E04 - Howl in the Ring