Other Title: 仮面ライダービルド-ほとばしれマグマ！, Kamen Raidā Birudo-Hotobashire Maguma!
Summary: Ryuga Banjou may not be human… Everyone froze after hearing Misora’s
words spoken while fighting Rogue within the Pandora Tower. Rogue was
speaking about using human experimentation on Ryuga’s girlfriend,
Kasumi. Not only that but Blood Stalk was involved as well. Is Ryuga
truly not a human? Meanwhile, the Kamen Riders alongside Sento burst
within the Pandora Tower that is being controlled by Stalk. Just when
that happens, something strange happens to Ryuga….