Caelus, an amnesiac young man, awakens in the Herta space station. He soon learns that he can transform into a warrior of light codenamed Ultraman Blazar. With his newfound powers, Caelus must travel across the stars with the Astral Express crew to eliminate the stellaron anomalies that threaten the universe. Along the way, he must also uncover the mystery of his own identity.

{Story under heavy editting} [I do not own HighSchool DxD and Kamen Riders. HighSchool DxD is owned by Ichiei Ishibumi and Kamen Riders own by Toei Company LTD. i only own by oc Kazuma/Hyoudou Ryusei] A young man has been transported to DxD world after he got an accidents on his way home from Toku Convention. When he wake up, he is on another world. A world he familiar with, High School DxD. Not only he waking up only with Build Driver along with Gold Rabbit and Silver Dragon, he also has Katsuragi Takumi inside his mind to guide him and both of them call themselves, Kamen Rider Superior Build

In a parallel universe, Earth has endured a century of devastation known as the Hollow Disaster, a catastrophe that unleashed ethereal monsters created by a mysterious organization known as Hundred. In these desperate times, New Eridu stands as one of humanity's last bastions of survival. From the shadows, a mysterious man named Wise appears. Armed with the Legendriver and Legend Rider Chemy Cards, he transforms into Kamen Rider Legend, harnessing the powers of legendary Kamen Riders from parallel universes to protect the people of New Eridu from any threat. But as Wise battles to defend the city, dark secrets from his past begin to surface. Will he rise as New Eridu's savior, or will his hidden truths bring about its downfall?