Terrasia Defense Force

Ganang is just odinary youth but with quite shameful life. His family are poor yet his father gone nowhere leaving him and his mother a really much debt.
Therefore he must work plus attend school at the same time.
Where desperate almost overwhelm him, a man in black suit offering him a job application. The job is to defend a place on another dimension from an ancient creature called Asura.
He quite do it well on his new job. But just when he almost done paid her father’s debt, someone killed her mother on specific purpose.
When he found out that the one who killed his mother was an ace at his work, he decided to stay forever on the another dimension, leaving earth to hunt down the killer.
But just when he find the killer, the killer told him about the truth about the world, his motive, and make Ganang choose weither he become The Hero of the Place or Monster of The World.