After the 39th and 40th Astroswitches are developed, Amanogawa and Subaruboshi High Schools hold a test transfer of some of AGHS's students to SBHS, which causes problems when the Aries Zodiarts makes itself known to the AGHS students. Kamen Rider Fourze: Climax Episode is the director's cut version of the combined episodes 31 & 32 of the Kamen Rider Fourze TV series.

Disgraced screenwriter Takuya Koizumi vanished after his TV drama “Loser” was cut at episode 7 and mocked online. Now he works at a convenience store, close to giving up. Returning home, he’s suddenly taken hostage in a local post office by Makoto Saegusa, a ruined middle-aged man who only wants to see his estranged daughter. During the standoff Saegusa realizes Takuya wrote the drama that once gave him courage and demands, at gunpoint, that Takuya “write the continuation of this incident.” As Takuya scripts events in real time, fiction and reality collide, and both men confront the past they want to redo, changing their lives.