Shoma, who is attacking people, is a "Granute to be defeated" and Hanto challenges him to a fight, but he is somewhat unable to come to terms with the situation. Likewise, Sachika, who was told the truth about Shoma by Hanto, is trying to come up with her own answer.

Meanwhile, Shoma learns that a man who looks like him in black is causing a commotion, and he secretly begins to investigate. But then Hanto appears! Hanto is again in battle mode, but with anger on his face....

The Shoma in black attacks a supermarket warehouse. In front of Shoma and Hanto, who rush to the warehouse, the other Shoma declares "I am Bitter Gavv" and transforms! Shoma and Hanto also transform into Riders and clash with Bitter Gavv!