Gu Yinli was a high school girl who died in a traffic accident; Hypnus, the God of Death in charge of sleep, had a deal of life and death with Yinli. He prolonged her life seven days longer and she might come back to life again once finished the task on time. They made deals with all kinds of people in the gap of time and space; Yinli recycled the chips of human commitment, which were the most precious things of the execution objects; Hypnus carried out his own plan secretly.