The Roidmude Brain is suddenly resurrected! Up to his neck in the machinations of an evil organization, can he finally realize his dream of becoming a Kamen Rider and saving the day?

It's hard being a hard-boiled detective and a Kamen Rider, especially when you have such an annoying girl who owns your detective agency. Shotaro often lets his mind wander following some of Kamen Rider W's most memorable cases.