Due to Ultraman Belial's many battles and subsequent injuries, his body cells went scattered across the multiverse as splinters and plunged it into chaos. The New Generation Heroes were tasked with tracking down these fragments to prevent any potential problems they could cause.
To combat the rampaging monsters, Hikari crafted the Z Risers and Ultra Medals, but several of these devices were stolen by a Celebro-possessed Genegarg, who proceed to race itself to Earth and was pursued by Ultraman Z.
Celebro had been attempting to use the Devil Splinters to create a Belial Medal, but when they weren't enough, he set his sights on Belial's son to assist him. He succeeded in creating the medal by capturing Riku and extracting the Belial Factor from his genetic material.
- Corruption: The Devil Splinters' main function is to manipulate its victims and turn them berserk.
- Revival: Devil Splinters can revive fallen opponents, as demonstrated with Gillvalis, who was revived and restored by a wayward splinter after it was previously destroyed by Geed.