GATE: Where the JSDF Fought

On a certain summer day in the year 20XX, in broad daylight a gate to another world appears in Ginza, Tokyo. An army and a swarm of monsters come storming through the gate. The Japan Ground Self-Defense Force is able to defeat the invaders and they head through the gate into uncharted lands. An epic fantasy about a battle between the human race and another world filled with dangerous enemies and beasts!

GATE : Where the JSDF Fought Vol. 1-23 set Manga Comics Japanese version

GATE：Where the JSDF Fought: GATE Jieitai Kanochinite Kaku Tatakaeri Vol.２ (GATE：Where the JSDF Fought：GATE Jieitai Kanochinite Kaku Tatakaeri Book 2) eBook : Satoru Sao, Takumi Yanai: Kindle Store

Gate: Jieitai Kanochi nite, Kaku Tatakaeri (Gate: Where the JSDF Fought) · AniList

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GATE - Thus the JSDF Fought There, RPG Item

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Is a specific person responsible for the GATE in GATE: Thus the JSDF Fought There? - Anime & Manga Stack Exchange