Responses
It's just a guess, but tobari probably met the man/demon when he was a child and most likely absorbed his spirit energy, thus gaining his abilities. Whether tobari remembers this or not is not known yet.
Ohhhh (￣∇￣") i see, Thank You!
that's a good guess! and it really makes sense for the story!
(I was gonna guess they were related somehow... but I think your idea is better)
What is the relationship between tobari and the demon in shape of a human? (sorry forgot his name)