Kotetsushin Jeeg is set fifty years after the original series and introduces a new cast of characters. The primary protagonist is Kenji Kusanagi, a high school student who transforms into Kotetsushin Jeeg to battle the sudden return of the "Haniwa Genjin" (also known as "Haniwa Phantom Gods" or clay robots) from the Jamada Empire, which is ruled by Queen Himika. The supporting cast includes Tsubaki Tamashiro, the granddaughter of Miwa Uzuki, and Kyou Misumi. Several main characters from the original series also make appearances.