Cayna awakens with a hangover in a village out in the middle of nowhere. While she's dealing with a headache, she hears people talking about hearing singing coming from a well. In order to find out what's causing it, Cayna summons a flying fish and dives into the well. When she gets down there, she discovers a massive underground cavern. And what she finds down there is...
Elenco: Yui Otagiri , Tomokazu Sugita , Sakura Nakamura , Daisuke Ono , Kaori Nazuka , Azusa Tadokoro , Yuuki Hirose , Eri Yukimura , Tomoya Takagi , Kanako Yanagihara .