29-year-old Satoru Fujinuma is sent back in time 18 years to prevent the events leading to his mother's death, which began with a series of kidnappings while he was in 5th grade.29-year-old Satoru Fujinuma is sent back in time 18 years to prevent the events leading to his mother's death, which began with a series of kidnappings while he was in 5th grade.29-year-old Satoru Fujinuma is sent back in time 18 years to prevent the events leading to his mother's death, which began with a series of kidnappings while he was in 5th grade.