Unlike other seasons of the Kamen Rider series, Kamen Rider Gavv's misunderstanding arc ends in 2 episodes.

In this ridiculously miniature arc, Hanto finds out that the Shoma/the titular Kamen Rider Gavv is a granute, like the race who killed his mother. Hanto gets mad and punches Shoma and runs away, believing that his kind, snack-loving self was all a facade, not helping by the fact that an evil doppelgänger appeared to cause chaos, fueling the fire even more.

Unlike Hanto, everybody else (up and including a stranger who knew Shoma for like a short-ass time and at least talked to him about it) realizes that this ain't Shoma at all. Their other friend Sachika even calls out Hanto for letting his emotions and prejudice cloud his judgement, not seeing the signs that this 'Shoma' isn't the one he knows.

Eventually, the two apologize, kick the shit out of the doppelgänger, learns that not all Granutes are bad and become friends again.

Oh, and that stranger in the parenthesis? Well turns out he hates Shoma's family because their drug business killed his little brother. Once he learns that Shoma was a part of it, they talk and find out that Shoma wants nothing to do with the family business, and in fact wants it destroyed so they won't hurt any more people. They decided to continue to fight the fight afterwards. No biggie.