Overview
The story begins with a regular day with Takumi, Mari and Keitaro, which suddenly turns into a musical number thanks to a mysterious new boom box created by Smart Brain. As it turns out, Yuji, Yuka and Naoya have the same boom box and are greeted by a rapping Smart Lady who reveals that it's part of a new plan by Smart Brain to invoke people into singing all over Japan. The reason: To get the three Rider Belts back!
| Actor | Age then | Age now | |
|---|---|---|---|
 | 19 | 41 | |
 | 15 | 37 | |
 | 22 | 44 | |
 | 23 | July 28, 2015 (35) | |
 | 18 | 40 | |
 | 26 | 48 | |
 | 21 | 44 | |
 | - | - |