The adventure continues in ATOM: The Beginning Volume 4, the prequel to Osamu Tezuka's Astro Boy! In their search for secrets about the mysterious Dr. Lolo, Six and his friends have been led to a hidden military base... but the compound won't be easy to access as it's guarded by the sentinel soldier robot Ivan! This dread construct seems to be a potent foe, but Six can sense a strange cry for help coming from the titanic war machine... © Tezuka Productions, Masami Yuuki, Tetsuro Kasahara, 2015.