Shinji is Takkong's companion, who came to the surface seeking Hiroyuki Kudo and the Tri-Squad's helping aiding Takkong seal away Giestron, who was about to emerge. Shinji explained that Takkong was getting old and its power was weakening, as well as Giestron's origins and intentions to destroy humanity as revenge for polluting the Earth.
At sunset, Takkong left for the ocean after Giestron's defeat as Hiroyuki and Shinji watched it, saying that Giestron would one day rise again and that the sea incarnation would rest until then. Shinji told Takkong to sleep peacefully before strangely disappearing into bubbles Hiroyuki looked around confused before seeing the young boy on Takkong's back. They both waved goodbye, Shinji's hands turning to tentacles as they descended back into the blue waters.