The action continues in volume 3! An ordinary middle-school student's life takes a thrilling turn when he encounters a powerful mechanical being in this exciting manga series for fans of My Hero Academia and Spy x Family. Now that Hikaru and Alma have been separated, Hikaru is desperate to find the missing Mecha-Ude. He'll need the help of Aki and the whole ARMS team, and perhaps even a bitter rival, if they're to save Alma from the dire fate the Kagami Group has in store.