The Crash in the Lake!
Due to his excellent deduction work and saving a woman, with some help from Agito, from a pair of Unknowns Makoto Hikawa is once again instated as the operator of the G3 unit. Saeko Shinohara tells Shouichi and Ryo that there are ruins of an ancient civilization in the nearby lake and that the people of the civilization use to revere a warrior whose mark bears a similar resemblance to Agito's mask. Unfortunately, Saeko seems to have closed herself off to other people after the Akatsuki incident.
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More from this season
S11 E1
The Warrior's Awakening
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.
S11 E2
Blue Storm
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.
S11 E3
My Transformation
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.
S11 E4
Puzzle Decoding
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".