flumpool are performing the opening theme song "Freeze." Daiki Yamashita is performing the ending theme song "Tail" for the show. In the anime's story, there were once many heroes who saved the world from Destruction. Time has since passed, and young men and women who have the title of "Successor" awaken powers from the heroes of old, and are entrusted with the fate of the world. The "Seven Knights" are a group of top Successors. Among the Seven Knights is a young woman named Faria, who is fighting against the troops of Destruction. In the midst of this battle, she saves a young man named Nemo. Nemo then awakens the power of a Successor, but no one knows of the hero whose powers he has inherited.