Hiroshi Nakahara, a 48-year-old father of two, was catapulted back to his adolescence with all his adult faculties intact. Now, aged 14, he watches as the school year advances - and the fateful day when his father disappeared forever without reason approaches. Can Hiroshi alter the past or is he condemned to relive it, powerless to change a thing? If he does, will he ever see his wife and daughters again?