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.

After defeating one of the Snake Unknowns Ryo Ashihara goes into shock due to the recoil of his powers and is abducted by the DNA child.

Makoto Hikawa's supervisors feel that they must rethink Makoto operating the G3 unit and have suspended all operations of the G3-System. Makoto reflects on the incident that led to him becoming G3.

Mana touches Shoichi Tsugami's head when he collapses and accidentally dives into his memory with her powers, discovering a terrible connection between him and her late father.

Mana Kazaya distances herself with Shouichi while she sorts out what she saw in his memories.

Agito unleashes a new power in order to stop the Corvus Croccio Unknown from causing anymore casualties.

The police department finally decides what action to take with the G3-System.

Agito and Another Agito battle and come to a draw, allowing enough time to let Ryo Ashihara, Koji Majima, and Makoto Hikawa escape. Tetsuya Sawakii meets Koji and Ryo and tells Koji that there is only one way to save Ryo... to transfer his seed of Agito to Ryo.

Toru Hojo and Sumiko Ozawa report to their superiors that Shoichi Tsugami is Agito and that he should be allowed to act freely. Their superiors decide to keep this fact a secret leaving Hikawa to wonder about who is Agito.

Ryo Ashihara awakens a new power, Exceed Gills, and manages to severely damage Another Agito but decides not deal the finishing blow. Makoto Hikawa, now knowing the identity of Agito, doesn't know how he should face Shoichi Tsugami.

Shoichi Tsugami and Makoto Hikawa have finally created a good fighting bond and their relationship is back to normal. Shouichi feels that it is best to figure out why Kaoru Kino attacked them is to talk to him and figure out why he is living in the past.

The El of Water has finally recovered and seeks to eliminate all the Riders once and for all.

Shoichi Tsugami has fallen unconscious during the fight with the newly evolved El of Water and all the pieces of his memories on the Akatsuki have put themselves together.

Meanwhile, Mana uses her powers to translate the letter found by Toru Hojo and learns the history behind the Overlords of Light and Darkness and the origin behind the seeds of Agito.

Agito unleashes his Shining Form and combines his strength with the other Riders and defeats the El of Water. The OverLord of Darkness realizes that Agito's power has become too strong and he must deal with the Riders directly to save his beloved humans.

After Kaoru Kino's seed of Agito is stolen from him the OverLord of Darkness turns his sights on Ryo Ashihara, looking to take Gills' power.

Shoichi Tsugami and Mana Kazaya go to Toru Hojo for answers about Mana's father's murder but is the truth they uncover more than they can handle?

Thanks to Ryo Ashihara, Shoichi Tsugami escapes from the OverLord of Darkness. Shouichi begins to question what it means to be Agito now that he believes that his sister killed Mana's father.

Makoto Hikawa is released and back on duty. Unfortunately, he is still suffering from a severe concussion.

Shoichi Tsugami takes solace knowing that he is no longer Agito and that he is free from a fate that could be much like his sister's. But with Agito, Gills, and Another Agito out of commission who will save Mana when she is attacked?