In the summer of 20XX, a "gate to another world" suddenly appeared in broad daylight in Ginza, Tokyo. What came out from the other side was an army and monsters. The Ground Self-Defense Force repelled this and stepped into the "Special Area" on the other side of the gate. The first installment of the epic-scale entertainment fantasy in another world!
I have watched the anime, so I thought I would give the manga a try. There are differences. The art style is more graphic, so the violence level is higher. I am still enjoying it. Will continue.