The Miraculous Meeting and the Phantasmagorical Adventure Part 1 - S0.E31

Hajime returns from the Sunken Ruins of Melusine. Feeling melancholic about having to part with Myu, he decides to take her on one last adventure. The voyage turns out to be more adventure than they had bargained for when a mysterious vortex approaches them while crossing the sea. Separated and surrounded by dark forces, Hajime must fight to find Myu in the first of two OVAs on this adventure.