Kamen Rider Zangetsu the Stage -Gaim Gaiden-

The film follows Takatora Kureshima, also known as Kamen Rider Zangetsu, as he returns to a site linked to a past experimental project by Yggdrasill Corporation. After an unexpected attack, he falls into an underground city, a perilous environment plagued by poverty and violence. With no memory of who he is, Takatora must navigate this treacherous world while being aided by the leader of Team Orange Ride.

As the story unfolds, Takatora discovers that the underground city is filled with young men fighting for survival, using Lock Seeds and Drivers to transform into Armored Riders. The hidden cameras monitoring their struggles reveal a sinister force manipulating the ongoing conflicts. This tension drives the narrative as Takatora faces threats from those seeking revenge against him. The themes of power, memory, and survival are central to the film's storyline, making it a compelling entry in the Kamen Rider universe.