Ocean of Secrets manga volume 2 features story and art by Sophi-chan.

On a flight back home, geology student Rai catches a glimpse of Lyronaz. Determined to find an explanation to what he saw, Rai begins an intensive search to find the mysterious floating kingdom. Meanwhile in Lyronaz, Moria discovers her father's involvement in the Queen's murder and finds out why Princess Anemone was kidnapped. As pirates prepare to destroy the land, the three kingdoms prepare for war.