My Melody arrives on Earth much to the surprise of her rival Kuromi. Together with one of the junior high school students, Yumeno Uta, they decide to protect the dreams of the people with the help of magic.

A continuation of Onegai My Melody.

Marisa, an ordinary magician, suspects a youkai is behind the winterly weather in the middle of spring. She goes off to investigate and soon arrives in the netherworld, facing the youkai behind the strange incident. Will her friend, the shrine maiden Reimu, arrive in time to save the day or will all be lost?

The story is set in Aquafall, a fantasy world abound with water and greenery, and populated by dragons and fairies. Meteorites suddenly bring forth evil creatures that threaten all living things on the planet. The fairy Syrup assembles the Aquafall Defense Force, with three girls of the dragon clans as recruits. The story follows Syrup and the dragon girls Leviathan, Bahamut, and Jörmungandr as they work together to battle enemies and grow up.