Without anyone knowing, the Earth is under threat from beings from a parallel dimension. Two boys and two girls find some bracelets made of an unknown material by chance, and because of that they are chosen to defend our planet. With the help of their master Tänpo, they will must learn and train the art of Sendokai combat, win two Great Tournaments and thus preserving peace on Earth. During their adventure, Zak, Cloe, Kiet and Fenzy, will meet friends from different dimensions of the Multiverse who will help them to become stronger warriors and to perform incredible feats. After their daring deeds, they will return to face life like the children they are.