2 brothers, Kai and Ano, aim to join the Guardian Brigade, to become Guardians so they can protect their loved ones. But despite his brother having incredible Ice power, Kai doesn't have any type of power. However, on the day of the ceremony where they received their Syncs (small personal objects that grant the user a boost in their power), in the heat of the moment, Kai receives a sentient Sync that only he can communicate with. With this, he, his brother, and their friends Zeke and Saiko, led by Captain John, must uncover secrets that lie behind their world.