Story following Kuromi as she travels around the world in search of her missing sister, Romina, who makes her first appearance in this anime. In addition to Romina, a number of new characters will appear, including the friends who travel with Kuromi and a member of an evil organization that stands in the way of their journey.

Teenage boy Takeshi and girl Michi get lost in the Card Battle world and have to win card battles to return home.

My Melody arrives on Earth much to the surprise of her rivals, Kuromi and Baku. 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.