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.

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?