A boy comes across a rabbit, guardian of a magical brush to prevent the Yamata no Orochi from re-emerging in the modern world.

Special effects modelmaker Kenzo Tokimiya has passed away. Akari, who did not have good memories of her grandfather's work, visits a farewell party for his fans with mixed feelings. There, she meets her classmate Takuya, a hardcore tokusatsu fan. Akari and Takuya meet a young man named Hozumi, who was going to be in the movie Brush of the God that Kenzo was going to make. This comes as a surprise to Akari, since this is the first she has heard that her grandfather was involved in such a production. Hozumi picks up a brush, a prop from the Brush of the God exhibit, and draws a circle in the air. "Please save his world!" With Hozumi's words, Akari and Takuya are swallowed by the wormhole that suddenly appears. The next thing they know, they have entered the world of the movie Brush of the God, greeted by the terrible visage of the kaiju Yamata no Orochi, which is not supposed to be in the movie, trying to burn everything in this world. In order to get back to the original world, the two must unravel the secret of the movie Brush of the God that Kenzo was supposed to make.