Project Build

Project Build was a top secret research project developed by Takumi Katsuragi. He conceived this project while studying Nebula Gas, believing he could harness it for some kind of use. To covertly do so, he founded Faust for the purpose of mass-weaponizing the Rider system for sinister warfare.

After Takumi Katsuragi had allegedly passed away, he entrusted the plans of Project Build to his mother. Eventually after a struggle with Night Rogue and Blood Stalk, both Sento Kiryu and Ryuga Banjyou are given the plans by Takumi's mother.