Ultra-Story: CiRCLE Madness!

Monsters returned to slumber after the Eternity Core was tampered with by a dark giant. Now, the Core is being stabilized by the heroes, the Hikawa twins.

Suddenly, An Alien Celebro cuts a dimensional warp and enters this world. This Celebro was chased after by Z and the Tri-Squad. But, Z didn't make it through and was stuck on the said dimensional warp.

On Earth, a particular establishment named "CiRCLE" is planning to hold an event. Various girl bands will join. In one particular band named Afterglow, their lead vocalist, Ran Mitake was walking back home alone after the first initial meeting. Suddenly, a monster appeared a few blocks from her location. That event will make Ran's life change for good, that event will mark her fateful encounter with one of the Tri-Squad and its Taiga.

(Based on Trigger: Episode Z and CiRCLE Thanksgiving Animation).