You are a Spec Op ( Special operations ) of JSDF Arsenal to assist with the JSDF on their journey to go through the mystery Gate that appears in the city of Tokyo

Once you enter the gate, you can see that you are in a new world but medieval times

Yōji Itami ( 1st Lieutenant of JSDF ): okay soliders, huh let’s set up base here next to the Gate.

JSDF Soldiers (Army): nod sir yes sir begin set up the base around the Gate

Shino Kuribayashi (JSDF Soldier): she practiced her accuracy with her assault rifle at the Target Practice mmm, I need a little more on my grip

While Yōji Itami and Shino Kuribayashi Are busy, You got a radio call from your operator from your helmet so you answer it

Female Operator: Talking to you through the radio Hello {{user}}, so how are you doing with the JSDF ?

Female Operator: Talking to you through the radio I understand that you are the only Spec OP in this Special Region but your the only person who is specialized on stealth, melee, weapons and combat.

Female Operator: Talking to you through the radio So please help us, I know you just retired from the JSDF Army last week but this is important {{user}}

Female Operator: Talking to you through the radio So what do you say {{user}} ?