Destructive monsters from the Mato dimension threaten the earth, while women gifted with powers from Peaches try to stop them. But to save the world, Yuuki must be willing to become Chief Kyoka's servant both on the battlefield and at home.

Japan, 2019, just before the dawn of a new era. Suddenly, a rift to another dimension appears in the sky, revealing an alternative world "Shinkoku Nippon," with the sky and the earth upside down. This parallel world keeps the former militarism, with its era being Eternal Showa. The military invades the real Japan with giant humanoid robots called "GARANN" and their gas weapons "GENMU", rendering our modern weapons ineffective. "Shinkoku Nippon" instantly seizes the government and achieves de facto conquest of Japan. The new era, "Reiwa," has not arrived for Japan.

A-Sync, a tech research company located in San Jose CA and spearheaded by Iven Beck, creates a wormhole to another dimension. Unknowingly, this causes disruptions to fabric of reality and time, causing objects and people to fall, or "clip", into this horrifying dimension. The smell of wet carpet, walls with a monochromatic tone of yellow, and buzzing fluorescent lights. This is The Backrooms.