In modern-day Japan, a crime-ridden city known as Anaki City, a secret experiment has begun: implanting the consciousness of notorious death-row inmates into the brains of ordinary citizens. One day, timid college student Mimi is chosen as a test subject. She soon finds herself sharing a body with Hyo, a death-row inmate...and her long-lost younger brother. Thus begins Mimi's daily battle against a group of ruthless death-row criminals... The fight is about to begin!