Toru Hojo flees the battle with the octopus Unknown after his attacks fail to work, abandoning the G3 suit and leaving Agito to defeat the Unknown.

Shouichi and Mana decide to track down a friend of Tomoko Miura who may or may not know about Shouichi's past.

Ryo Ashihara discovers a notebook in his father's belongings full of names and tries to figure out what his father was working on before he passed away.

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.

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.