Gate - Jietai Kare no Chi nite, Kaku Tatakeri

An entryway shows up in Tokyo's Ginza area at some point in the 21st century. From the door spills out creatures, knights from middle-age Europe, and other dream like creatures, and they slaughter a number of the subjects of Tokyo. This occasion is known as the Ginza Incident. The administration sends a little gathering of officers from the Japanese Self-Defense Forces to the substitute world past the door. Driven by otaku officer Yoji, they find that the towns on the planet are being assaulted by a mythical serpent. A mythical person young lady who is a survivor from the monster's frenzy joins the gathering in their goes over the unsafe new world.