In 2006, 29-year-old Satoru Fujinuma, a struggling mangaka living in Chiba, possesses an involuntary ability known as "Revival" that sends his consciousness back in time moments before a life-threatening incident, enabling him to prevent it from happening again. When his mother is murdered by an unknown assailant in his own home, Satoru's ability sends him back eighteen years into the past and Satoru is given the opportunity to not only save his mother, but also prevent a serial killer from taking the lives of three of his childhood friends including a young girl from another school. source: Wikipedia