Kakuriyo no Yadomeshi: Season 1, Episode 20

1 - 20: Traces of a Dream in the Dragon Palace.

Aoi needs to find the mermaid scale, so she goes to the ruins of the dragon palace, a place with a strong curse, with the master. Aoi and the master aren't affected by the miasma, but they get separated when she hears a voice calling her name.