At the end of the 20th century, the Earth Defense Force continued to protect the earth from aliens and monsters that invaded one after another. Returning to the origin of his successful work "Earth Defense Girl Iko-chan". With AKB48's Haruka Katayama and SDN48's Kayo Noro as cast members, nine unique beautiful girl members fight against the invaders to defend the earth.

Yamagami-kun, the god of the mountain, likes to eat "human beings"! Today, he and Isobe, the god of the sea, are planning to eat "human" again. Will he be able to eat a "human" today?