Shinichi Nagakawa and Yuuki Sanada are both involved in an accident and die together. However, they are given a chance to live again. God grants them seven more days of life, but once their time is up, one of them must die again. Oh, and there is one more catch. God decrees that their lives will be shared, including emotions and physical sensations. They are also unable to leave one another's side. What will happen during those seven days?