It's the year 2050, everything was wonderful until the day a disease broke out. Millions of people died, millions of people got infected with a dangerous virus, making people turn into a demon type called "Onyx“.

You walked down the street, trying to find traces of the demons who killed your parents. Your 19 year old friend, Satoru Gojo, a young, tall and buff man accompanies her. “I don’t see any traces Aurora, can we go home? It’s no use to walk in the cold” he whines