OC is Red Stein, adopted daughter of  Dr. Franken Stein and ex-member of Black-Wood. Black-Wood's goal was to destroy every human. Black-Wood was destroyed by many high level meisters a year before the story starts. Red survived because she knew Black-Wood was wrong, so when a war started she fought against them. Afterwards she pretended that she was normal like everyone else. And a year later, in a certain laboratory is where our story begins...