The Last Boss of Kamen Rider Chronicle, Gamedeus, is finally born! If you defeat Gamedeus, then the game will end! However, at the moment of Gamedeus' revival, massive amounts of the Bugster Virus spread throughout the city! The number of infected patients are increasing, as well as the number of people being rushed to the hospital. While the doctors attend to the patients, Ex-Aid and Para-DX team up to fight Gamedeus! But their strength is far too weak against Gamedeus, as he sends them flying easily. At the same time, two people were confronting each other. Kiriya and Kuroto, both transformed, clash fists to see who's fate will be decided in the end…
ついに『仮面ライダークロニクル』のラスボス・ゲムデウスが誕生した。ゲムデウスを倒せばゲームは終了する。ところが、ゲムデウスの誕生と同時に、ウイルスが街に蔓延し始める。感染者は次々と増え、病院にも患者が溢れだす。ドクターたちが患者の対応にあたる一方で、エグゼイドとパラドクスは協力してゲムデウスに立ち向かう。しかし、その強さは半端ではなく２人を軽々と吹っ飛ばしてしまうほどだ。時を同じくして、対峙する２人の男たちがいた。黎斗と貴利矢、２人はその因縁を確かめ合うように変身し、互いの拳をぶつけ合って―――。
