In the episode today, the final battle between Aruto and Horobi now begins. The Kamen Riders and the others were trying to prevent them from fighting each other and cause an all-out war between humanity and Humagears but to no avail.

Aruto is also transformed into Zero-Two once again to fight against Isamu, who was trying to reason with him before he transforms into a new form: Orthoros Vulcan (オルトロスバルカン Orutorosu Barukan) after he was given the Japanese Wolf Zetsumerisekey by Naki, who is also trying to stop Aruto. But, this form gives out lots of strains, due to the data of the Japanese Wolf being forcibly uploaded and caused his A.I.M.S. Shotriser to break apart with the Japanese Wolf Zetsumerisekey damaged.

This is the Zetsumetsu Driver (絶滅ドライバー Zetsumetsu Doraibā) that Horobi uses to transform into the final form: Ark-Scorpion (アークスコーピオン Āku Sukōpion) with Ark Scorpion Progrisekey (アークスコーピオンプログライズキー Āku Sukōpion Puroguraizu Kī). Like Hiden Zero-Two Driver, it seems that Zetsumesu Driver was a retooled version of Hiden Zero-One Driver, which was stolen by the Ark before it was modified by Azu to become the Zetsumetsu Driver.

https://youtu.be/n-BsCrJ0mDU

In the next and final episode, Aruto seemed finally regained his senses and now returns to leap towards his dream. He also managed to get his Hiden Zero-One Driver and transforms into Zero-One once again in this final battle. Now, who will emerge victoriously? Aruto or Horobi?

Meanwhile, according to the Kamen Rider Wiki, it is said that an unknown Kamen Rider will make its debut in the final episode. I wonder who is it...