Souls... they tend to stick around for specific personal reasons if they fixate on it hard enough. Obsessively.

...Unless they really can't move on nowadays thanks to the Severing- that's possible too.

[Sounding a bit less like some low-life biker teen there, but side effects from borrowing information out of planted memories must be endured.

Also Reina accused Noboru of feeding on corpses. Don't humans have a thing about bodies being "desecrated" or something? One can connect the dots.]

But helping ghosts isn't part of my role or expertise. You'd have to talk to a... [Brief beat.]... psychopomp angel.