Other Worlder. MXM

This story is heavily inspired by the anime "World Trigger", not what inspired the mxm, and it is also inspired by a dream I had that gave me this idea. I hope you enjoy.

The human world was attacked by people from another world they called NC 56 years before this story is placed. The people from that world are called Neighbors. The human's decided to make an organization called World Control to try and protect themselves the next time they are attacked. The humans created devices to use during these times by using devices they got from attacks done by NC. They called the devices arrow since that is what the neighbors called the devices. Humans have to use mana to use the devices. There are also stronger devices that are called white arrow. After the humans got the regular arrow devices, some humans that were strong enough beat neighbors with the white arrow devices and took them.

Alexander is 21 years old and is from the human world.
Jiyo's age is something that you will learn while reading and he came from NC.
How will their story turn out?

TW
Fighting.
War.
Swearing.
Possible Smut.
Detailed Gore.
Drugs.