A 4-koma set in the "school" at the Alnus base.

A spin-off focusing on Princess Pinya's (from "Gate - Thus the JSDF Fought There!") life before the "Gate" opening to the other world event.

From: /ak/
After graduating from their constant fighting, some magical girls were unable to keep up in class, got poor grades, and became NEETs. In order to help these poor former magical girls, the cleaning company "Mei Company" was founded! Will swapping their magical staffs for cleaning tools help to rehabilitate them? Gate protagonist Itami's beloved doujin manga about former magical girls cleaning up messes.

A gate appears in Tokyo's Ginza district sometime in the 21st century. From the gate pours out monsters, knights from middle-age Europe, and other fantasy-like beings, and they kill many of the citizens of Tokyo. This event is known as the Ginza Incident.

The government sends a small group of soldiers from the Japanese Self-Defense Forces to the alternate world beyond the gate. Led by otaku soldier Yōji, they find that the villages in the world are being attacked by a dragon. An elf girl who is a survivor from the dragon's rampage joins the group in their travels across the dangerous new world.