"Have you ever talked to yourself and unintentionally said "we" instead of "I"?". Yuuki, a decent guy, with boring and unrewarded life. One day, he wakes up in hospital after he was involved in an accident. Strangely, he developed a second personality named Kira, a real person who died at the same time of the accident. Kira was the head of a famous and powerful gang, but he was betrayed, so he wants to use this situation and take revenge on the people who caused his death. Will that work out?