The +Anima are beings who possess animal-like powers. In this alternate universe, they walk among us- shunned by society- as they search for others who have similar powers.
As Cooro and company travel through a dark tunnel on the way to Sailand, Husky tells them the reason why he wants to go there- to see his mother. But it looks like the family reunion will be delayed when the children discover that in Sailand, +Anima are kept as slaves! And if that weren't bad enough, Husky and Senri are captured by slave hunters! Can Cooro and Nana fly them to freedom?