The common cause is almost always "I'm not paid enough to deal with this crap."So...
The waiter just came in, saw a mafia looking old dude alone together with a terrified crying school girl, and left?
Dude went:"Hey whatever you 2 are doing in here, not my problem."
i think because seto see thing black and white, people good ghost bad'on the side of the people', huh... Makes me think of Kaya-chan and how the people in her series don't view her as human.
it's really cool honestly, on top of having weapon to fight back he also wont get affected too much by the spectre disturbance and power because he can't see themThat's a very minor but interesting plot twist; being unable to see them. It's like the antithesis of the MC, who can see everything clearly but is unable to do anything about them.