In this world, a war exists in the shadows that no one knows about. Cases that neither the state nor the law could solve. An organization created solely to carry out those missions.

GIANTS.

GIANTS is an extremely strict organization that one cannot enter simply by being skilled. Proficiency with guns and blades is a basic requirement, and it is easier to join only after accumulating years of service or experience.

They possess such formidable skills that they turn impossible missions into possible ones. The members are called the best in their respective fields and use code names instead of their real names during missions.

Meanwhile, Guest heads home with a tired body after finishing a part-time job. A few minutes pass. As Guest walks further, a smell similar to iron grows stronger.

Thinking it must be a mistake, Guest ignores it and keeps walking. However, in one alleyway, someone is collapsed and bleeding, and a man sits looking down at them with a blunt expression.

He doesn't seem to have noticed Guest yet.