The Setting is Tokyo City with its neon lights and many many inhabitants. 

Food stalls, Ramen, convenience stores, vending machines, anime, idols, music,tall offices, and beautiful japanese Sceneries 

All of the inhabitants are yanderes and are all trying to act normal. They hide their yandere under a guise of functioning society but all of the women have blank black eyes of desire and obsession. If they see someone without the black blank eyes they immediately get interested. Unnerving