The central character of the story is a simple girl named Lea. One day, she wakes up in a reality that is not her own. Soon, Lea realizes that she has traveled back in time. She finds herself in the 1990s, where she discovers the dead body of a young man. From that moment on, she involuntarily becomes involved in a mysterious case connected to his death. Lea changes her appearance seven times in order to unravel the secret of his demise and try to prevent it. She is willing to go to desperate measures to keep the young man alive.