The river of souls that control the cycle of reincarnation has no guardian to speak of. There is no heaven, no hell and no one to judge your sins. It is so mysterious that even the most powerful of beings that manage to reach it is barely able to interact with it.
It is no one's will that the souls go there when they cease to die, and it also no one's will that the river of souls is in the form of a river. It is simply the effect of the laws of the world and is part of nature.
As is all part of nature, accidents happen. Accidents are a common occurence to the river of souls although it is not a daily case. One peculiar soul however achieves an accident so rare that it was the first time in history it happened since the world began. It was a soul that resulted in three different hearts when it reincarnated.
