To take preventive measures against further atrocities caused by the Unidentified Life Forms, the police introduce the G3 unit. But when it is time to fight the murderous Pantheras Luteus, the G3 falls short to the power of Agito.

After the murders of the Saeki family, Makoto Hikawa decides to do some digging into the photo he found of the son, Nobuhiko. Halfway through his investigation two more "Unknowns" appear.

At the same time Shoichi Tsugami, who is trying to get along with his adoptive family, falls into a trance-like state and becomes the Kamen Rider Agito.

Agito turns on G3 after defeating Pantheras Albus and Pantheras Tristis, damaging the G3's suit severely. The police have no choice but to label Agito dangerous.

Shoichi Tsugami comes to grips with his situation and declares that he must "protect the place where he belongs".

Ryo Ashihara finally awakens from his critical state to quit the swim team and go rogue.

The O-Parts lab finally unwound the ancient puzzle, revealing a mysterious DNA model, and they try to replicate the DNA.

Shoichi Tsugami decides to leave home after being seen transforming into Agito by Mana Kazaya.

Ryo Ashihara's swim coach tracks down his star swimmer and Ryo decides to "show him everything".

The O-Parts lab has been disassembeld after the DNA baby escaped, leaving more questions than answers.

Ryo Ashihara, after being distanced from his swim coach, tries to get back together with his former girlfriend Mayumi Kitahira, Mana Kazaya's new math tutor, as a way to keep him grounded as he tries to figure out what is happening to him.

After being saved by Agito from the two snake Unknowns and seeing Ryo Ashihara accidentally change into Kamen Rider Gills Mayumi Kitahira decides she must put distance between herself and her former boyfriend.

Seeing her leave Ryo decides to put his transformation to the test, but he must battle the monster within himself.