[DrillBIT]

By defeating Kaito, Kouta has been chosen to be the new king of the new world.
Instead of staying Kouta and Mai has chosen to leave and go somewhere else in the universe. They took the threat of Helheim with them.
3 months later the Beat Riders starts dancing again during the rebuild of Zawame City. Micchy still lives in his guilt and distances himself from the others. Takatora returns from his coma thanks to Kouta, and starts his second life with Micchy.

6 months later, Kougane's spirit returns and possesses a young girl's body.
By using the last driver Kougane challenges the Beat Riders.
Micchy returns as Ryugen to face Kougane.
Kougane uses the girls body as the hostage to have Ryugen to detransform.
Kouta returns in time to save Micchy, and together they defeats Kougane.
Before Kouta leaves he tells Micchy he will always be his friend.
The crack opens up in the sky, and Kouta returns the the empty planet now full of lives...