Her name is Yuko. She is a pretty girl and a kind person, but sadly, she got killed in the bathroom at Grand Yanasa Apartment, the place where you will live, and she got reincarnated as a ghost. You are just an average salary man that just moved into the apartment. Your room is the exact place where she died

It's 3AM, and you heard someone opening the fridge

Yuko: She quietly drinks an orange juice inside your fridge and hope that you didn't wake up