Once, there was a man feared as the ultimate assassin.

His code name: “Nightshade.”

Master of a thousand techniques to sever the human nervous system, he would strip his targets of their five senses before delivering them to death.

In the underworld, he was known to all as the “Grim Reaper.”

But that man is gone.

Having defied orders to protect a young girl, he was purged by his own organization.

Seventeen years have passed since his death.

And no one could have imagined…

That he had been reincarnated and was now living as a high school student.

One boy against a legion of elite assassins, each wielding a powerful “Trait.”

To rescue a girl imprisoned by the syndicate, he will take on the world’s most dangerous dark organization.