Gate is a tV series anime that premiered in summer 2015, produced by A-1 Pictures.

About the production: the story comes from a light novel, there are 12 episodes of about 23 minutes and its current status is "finished".

Its main genres are action, adventure and fantasy, with themes such as Military, Isekai, War and Alternate Universe.

On AniList, Gate has an average score of 74%, a good score, and appears on 201,011 users' lists.

The franchise continues in or follows from: GATE: Jieitai Kanochi nite, Kaku Tatakaeri Part 2.

The military fantasy series begins when 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 (a replacement for Japan's military) to the alternate world beyond the gate. Led by otaku soldier Youji, 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. (Source: Anime News Network)

Official synopsis from AniList.