There is a kind of person in this world.
When she is born, somewhere else in the world, another person just like her is born at the same time.
They share a soul and split their lifespans between them, and many of them also gain some kind of dangerous "ability."
If they meet, the two are sure to become kindred spirits and the closest of friends, but their parents don't see it that way.
That person stole half my child's life!
And the only way to restore their souls and lifespans is to kill the other. Then the surviving half can become whole.
Besides dealing with half-person ability users who go berserk, the Mandragora Guild also takes on such dirty jobs in secret. Among its members, one pair of half-persons left behind a legend known as the Blood Wolf Duo.
Whether it's a covert dirty job or a public purge, they complete every mission perfectly.
But after one of them died, the other retired.
Until that child appeared...
For the formula money, the "Lone Wolf" is back in action.
The author's a bit lazy. If anyone's reading, please leave a comment or something, experts. Your support is my greatest motivation!