So i got that Iori and Yuuichi left together, but what about Yuuichi's powers? Won't he ju...

I think they committed suicide togther... because either way one of them was going to die. So they committed suicide then they both could be together. The faded stamp could b considered evidence to... just don't know why she got it now ┑(￣Д ￣)┍

Well at least with the inconclusive ending, I can continue believing everythings gonna be okay. ;-;