So this isn't really a chapter but more an explanation of how Souls work in the context of this fanfic, think of this as my version of Gege's end of chapter notes where he explains the exact nature of a technique so are you ready, cause here we go.
So first things first a Soul is different from a Soul, a Soul is exactly what people generally think of when they imagine a soul, the part of the person that is typically immortal and is where consciousness resides and what part of ourselves moves on to the afterlife, this is what Mahito's technique manipulates.
Now Souls are basically the anchor or bridge that connects the Soul to the body and prevents the soul from just disappearing into the afterlife, the Soul is not immortal and shatters upon a person's death and the reverse is true as well.
There is a reason that this distinction exists and this will come up in the future especially when we get into Sans' Karmic Retribution, but that is for another time, if you have any questions comment to this chapter and I will try my best to either answer them here or in a future chapter.