Seventeen years ago from now, a famous assassination organization existed in the human empire.
It was so famous that even other races knew about its existence.
There were rumors spreading around that the assassins of that organization were all specially trained killers and they had a 100 percent success rate in every mission.
The identity of the boss of the organization was unknown, but people knew him from his title of 'The Soul Splitter'.
Some even said that the organization was being funded by the SS-rankers themselves and the government was using this organization to do their dirty work.
Regardless of the rumors that were spreading in the world, the organization remained true to its principles.
They took missions like sneaking into the territory of another race and assassinating key figures or stealing important documents from other races, etc.