Vail (ベイル, Beiru) is Junpei Shiranami's inner demon and the source of his powers as Kamen Rider Vail (仮面ライダーベイル, Kamen Raidā Beiru). He later transformed into Crimson Vail (クリムゾンベイル, Kurimuzon Beiru) to resolve his 25-year-long conflict with Genta.