Kamen Rider Chronicle is an augmented-reality video game produced by the Genm Corp and distributed as a Rider Gashat. Its true purpose is to serve as a tool to control humanity by trapping people within it.
Players use the Kamen Rider Chronicle Gashat to transform into "Ride-Players" to fight Bugster bosses in order to claim their Gashatrophies. Anyone who collects all the Gashatrophies will be given the power to transform into "Kamen Rider Cronus" and fight and defeat the final boss Gamedeus.
In Kamen Rider Outsiders, the rogue AI Zein reactivated the game to trick players to be used as sacrificial lambs under the euphemism of purifying humanity of malice.
History
Development of Kamen Rider Chronicle was initiated by Masamune Dan, who secretly intended to use it as a tool to control humanity. However, after Masamune was framed by his son Kuroto Dan for causing Zero Day (which Kuroto had in fact actually caused) Masamune accepted the blame and allowed himself to be sent to prison in order to absolve him of guilt for the events that would follow.
Kuroto Dan then seized control of |Genm Corp and the development of Kamen Rider Chronicle, intending to use it as a way to have humans fight against Bugsters for eternity as a testament to his genius and, secretly, as a means to resurrect his deceased mother, Sakurako Dan, who had perished after being infected with the Bugster virus.
After Dan was betrayed and killed by Parado, the Bugsters themselves took control of Genm Corp and Kamen Rider Chronicle, plotting to use the game as a way to genocide humanity as revenge for creating game characters whose only purpose was to get beat up. However, the Bugsters soon lost control of the game when Masamune Dan was released from prison after being acquitted for causing Zero Day, obtained the powers of Kamen Rider Cronus and took back his company, revealing himself as the true mastermind behind Kamen Rider Chronicle and reverting the game to its original purpose of being used to control humanity.
However, the game was later shut down by the Kamen Riders and CR by defeating Gamedeus and Masamune Dan/Kamen Rider Cronus. As a final act of spite, Masamune Dan killed himself to prevent the victims of Kamen Rider Chronicle from being saved.
Seven years later, the data of Kamen Rider Chronicle is used to power up the Zein Driver. Unbeknownst to Zein's supporters, history would eventually repeat itself as Zein plans to restart Kamen Rider Chronicle under the euphemism of purifying humanity of evil. Zein takes advantage of Horobi's fall out with the faction by allowing Kamen Rider Garren to destroy the Ark, followed by possessing Yuto Sakurai and subsequently copied Nico Saiba's voice to trick Genm Corp. into relaunching the game.
With the game restarted, Zein begins a mass summary execution spree on Ride-Players who are caught crimes on broad daylight, regardless of the severity of their transgressions. Any offending player caught red-handed is imprisoned in a Zein Card instead of being digitized into data, and the carded player is shredded inside Zein Driver, killing the trapped player inside. Zein continues persecuting and executing people unimpeded until Kuroto Dan confronts the AI for misusing the game he created without his consent. Kuroto transforms into Genm Fumetsu Gamer to push Zein to its breaking point by stealing Kamen Rider Zero-Two's data. In retaliation, Zein destroys Kuroto's Humagear, seemingly killing him, leading to the chain of events where Ark and Zea fuse into Zero-Three, and used the God of Genesis's powers to fully resurrect Kuroto as a human.
Later on, Misora Isurugi, as her Miitan persona, streamed a PSA to dissuade players from playing Kamen Rider Chronicle, causing the game's player numbers to drop drastically, effectively bringing it to a complete stop, this time for good. However, unlike in Ex-Aid, where those who died from playing the game were revived thanks to Kuroto Dan's Zombie Chronicle, the deaths caused by Zein's witch-hunt game are permanent and irreversible, even after Zein's defeat none of the Outsiders nor Foundation X have the resources to undo the player deaths.
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