World Of Sync, Vol. 1 by Trenton Hall

Two brothers, Kai and Ano, aim to join the Guardian Brigade in their city. But on the day of the ceremony where they received their Syncs, small and personal objects that grant the user a boost in their natural power, Kai, who doesn’t have a power, receives a sentient Sync that only he can communicate with. With this, he and his future team are set on a path and must uncover the secrets that lie behind their world.

Kai, along with his brother Ano, and 2 friends, Zeke and Saiko, all join as a team underhead by the Guardian: Captain John. but on their first days, they unexpectdly cross a secret organization that becomes more trouble than they would’ve guessed.