Mebius is a rookie Ultra Warrior and has a lot to live up to. He is chosen as the new protector of the earth. This series is set in the same universe as the original timeline; when Mebius first appears to fight a monster, it is mentioned that this is the first time an Ultraman has appeared on earth in 25 years. Under the guise of Mirai Hibino, Mebius joins CREW GUYS, the monster attack force of this series.

At the start of the first episode, all of the original team members of GUYS, save Ryu, are killed off in their first monster battle. Mirai gathers a group of people he meets in an evacuation to join the new GUYS because he feels they have the right heart to be on GUYS.