Mach tries to help an ex-convict prove her innocence after she becomes a murder suspect. Meanwhile, Heart assists the police investigating Roidmude-like beings.

Set 3 years after the TV series, Go Shijima returned from the US to revive his buddy Chase with the result of his studies. However, Go accidentally revives Heart, with Brain and Medic in his mind. Heart thinks why he could return, and then he starts to work as a Kamen Rider Heart following Detective Otta. Meanwhile, Go has built a loving relationship with Reiko, who was exploited by Roidmude 005. Now, something happens to her.