With memories of his father's inexplicable death haunting him, Daichi follows a mysterious rainbow and travels to Tanegashima Island to investigate. Arriving on the island with mixed emotions, Daichi runs into a boy named Teppei who asks why Daichi has returned to this island. Daichi knows he’s returned there to fulfill a promise. Now, with panic alarms sounding and an unruly force known as the Killtgang quickly approaching to attack, Daichi must suit up for the invasion.
Puck intends to become the supreme leader of the all. He takes control of Blume and possesses Hana. The Planetary Gears learn that in order to stop puck they must sacrifice themselves. Daichi fights harder than ever to save Hana and end Puck.