April Fools in Kamen Rider

Toei loved playing practical jokes and spreading hoaxes on.

Drive Saga: Kamen Rider Brain
In an April Fools' joke for 2017, the official Kamen Rider Drive Twitter announced a V-Cinema "Drive Saga: Kamen Rider Brain" (ドライブサーガ: 仮面ライダーブレン) which will be released in 2035, throwing back to Brain's line about being the next to become a Kamen Rider at the end of Kamen Rider Heart. The joke post was made to commemorate the closure of the account.

Kamen Rider Genms: The Presidents
An April Fools' joke in 2018, the official Kamen Rider Ex-Aid Twitter announced a new season named "Kamen Rider Genms: The President " (仮面ライダーゲンムズ ーザ・プレジデンツ―) which will be released and discontinued at the same time in 2020, featuring Masamune Dan, Kuroto Dan, Ren Amagasaki and Tsukuru Koboshi. The four presidents will rise to change the world and the shareholders. The title is an in-joke to Kamen Rider Amazons and series writter Yuya Takahashi also joked that he will write this.