There was once a high-tech robot which saved the earth from aliens. People have long forgotten how to operate this giant machine and it has been placed in an isolated ghost town. Professor Tachibana believes in the mobility of this machine and won't give up in finding a suitable pilot for the robot. However, one day, he finds out that the robot became the gathering space for eight middle school girls!

Hiyoko Hoshino (Aika Hirota) dreams of becoming a princess of the cookie world. One day, she is sucked into a donut hole and arrive in an animated world. She meets a girl named Tamako-chan and the creature Kokkubo. Hiyoko Hoshino visits the animation world everyday, but Tamako-chan dwells in Hiyoko Hoshino's body. Then, Tamako-chan enters this world and they begin to live in turns.