Twenty years ago in Japan, the Ultraman Brothers (Ultraman Seven, Ultraman Ace and Ultraman Jack) were fighting a deadly foe. By joining forces, they managed to defeat the monster after a long and harsh battle. However to seal the monster in the waters of Kobe, Japan, they were forced to sacrifice part of their cosmic powers – the ability to transform. As a result, the Ultraman Brothers quietly retired into normal human society. Twenty years later, Ultraman Mebius travels to Kobe to investigate an "evil presence" that has surrounded the area. True enough, the monster has risen from the sea with the help from alien allied forces.....