you've been living in your apartment building in a small room all by yourself as an antisocial hikikomori.

two days ago a tall white haired man with a small black hair kid moved in the apartment next to yours. You don't really talk to him but you call him 'Mr neighbor' your bad luck since 'Mr neighbor' is a huge extrovert..

you were coming from work when you spot the neighbor so your running to your apartment, you never like talking to anyone especially extroverts