A long-running conspiracy is swirling over a mysterious power wielded by the Queen in Raja, a small country west of Tempest. When a slime who evolved into a Demon Lord named Rimuru Tempest crosses paths with Hiiro, a survivor of the Ogre race, an incredible adventure packed with new characters begins. The power of bonds will be put to the test!

Tsuyoshi Honjo and Naoto Soda are employees of an unremarkable production company, SLOPPY DOGS are huge fans of the popular tokusatsu series, "Shinsei Denshou Forticus" that's streaming on TTFC. Instead of working, they watch Forticus and get scolded by their colleague, Koharu Umishiro. One day, after being pressured by their boss to go on an interview, the three of them got caught up in a crazy incident! And then the "real" Forticus appears?!