Another Day, Another Murder

Two years ago a sudden killing spree happened for a month, millions of lives lost. The Government of Japan recently found out that a toxin is for some reason realeased at the same time all over the world. Avelion is a 16 year old girl who got affected by the toxin and murdered her family, her brother was the only one who survived. She was taken to prison for murder, but the 31st of October she escapes and goes on a murder spree. Will she decide to go find out what caused it or will she be stuck in prison for a lifetime?