The story depicts the year 20XX, when a sudden "door to a different world" appeared in Ginza, Tokyo, and a large number of monsters and armies surged out of it. While repelling them, the Ground Self Defense Force also rushed to the "Special Zone" on the other side of the door. So, Idan Yao, the otaku of the second-class landguard who served as the commander of the third reconnaissance team
The story depicts the year 20XX, when a sudden "door to a different world" appeared in Ginza, Tokyo, and a large number of monsters and armies surged out of it. While repelling them, the Ground Self Defense Force also rushed to the "Special Zone" on the other side of the door. So, Idan Yao, the otaku of the second-class landguard who served as the commander of the third reconnaissance team