It is a world where demons live. Deep in a forest where crows' caws echo is a large, antique mansion. The demon girl Kurotsuno lives there, passing the time with her unusual friends. Her favorite things are sweet pastries, chocolate, and... the beautiful full moon in the night sky.

The beautiful blue sky, the vast blue sea. A tiny boat in crystal clear ocean. The sea witch Wadanohara, along with her familiars, is returning to her underwater hometown after a long time away. But before her looms her first familiar, Samekichi. "You… Get away from this sea right now. You should not be here…"

The Sea Kingdom was invaded by the Totsusa Kingdom, but Wadanohara and her familiars managed to hold them back. The two princesses faced off with one another – and suddenly the two kingdoms were at peace. The war was seemingly over…. However, Wadanohara's original familiar, Samekichi, was thinking. "Wadanohara.. I will definitely… protect you." What are his true intentions? All will be revealed soon.