Why is Mafia 3 so high?
I'd assume it was on sale for ¥100. It happens quite often actually. My guess is Sony aren't allowed to put Z rated games on PS+ or something so instead they put them on sale for ¥100.
God of War 3 Remastered is currently on offer for ¥100 and I believe it's also the current PS+ game for the west, hence my theory. Also, expect to see GOW3 very high on next months physical+digital chart