RIDER TIME 仮面ライダーディケイド VS ジオウ -ディケイド館のデス・ゲーム Chapter 1: The FIRST Stage-

ある日突然、絶海の孤島に集められたソウゴやユウスケ、スウォルツ、ウール、オーラたち8人。記憶のない彼らの前に突如として仮面の男が現れる。仮面の男は生死を懸けた王様ゲームを始めると発表し...。

Various people with different backgrounds, including an unusual Sougo Tokiwa, are waking up finding themselves stranded in a house on an isolated island and forced to participate in a death game by a mysterious masked clown. After each round, a loser is killed by a monster emerging from mirrors. As the body count gradually increases, a strange passerby suddenly appears.