Kenzaki is captured by the mysterious Isaka, but Tachibana manages to escape the attack. He enlists help from Shiori and Kotaro to search for Kenzaki.

Kenzaki and Karasuma carry an injured Tachibana as they narrowly escape Isaka’s facility. Karasuma reveals the truth about Isaka and his organization.

While Tachibana questions his ability to become Garren and fight the Undead, Hajime struggles to understand his humanity.

Tachibana's "sickness" is cured and he is able to transform into Garren once again, but at what cost? Hajime questions Jin on human emotions.

While fighting Ikasa, the Peacock Undead, Blade is attacked by an unlikely opponent - Garren. Meanwhile with no place else to go, Hajime stays with Jin, but an Undead appears.

It's Blade vs Garren as the Spider Undead—a more powerful, Category Ace Undead—appears. A worried Sayoko investigates the cause of the changes in Tachibana’s body.

Isaka's plans are in motion, as he seeks those marked by the Spider Undead - those with the potential to become his perfect Rider.

As the race to seal the Category Ace continues, Ikasa sets his sights on the one thing that could interfere with Garren.

The Dragonfly Undead kidnaps Amane and her mother, intending to lure Hajime into a trap. Isaka's Rider System is complete, and all that remains is finding a compatible host.

Tachibana retires as Garren, after his involvement in the creation of Isaka's Rider System. That night, the Leangle belt goes missing.