On the night when the Kyuubi attacked the village, Toru Kamiya, an apprentice of Konoha's sealing class, saw his name on a list of those killed in action written in advance.
There is no limit to blood inheritance, and there is no invincible ninjutsu. His only reliance is the "Ink Vision" that can see the structure of ninjutsu and seals.
When more people who shouldn't have died appeared on the list, Kamiya Tetsu discovered that behind every tragedy in the ninja world, someone was collecting the names of the dead.
Since blood determines strength and prophecy arranges death, he started with the most basic seal and carved everyone's escape route into the ninja world.
