natsuiro no sunadokei
A visual novel game by Princess Soft, in which the protagonist, Kotaro, must save his love interest, Kaho, from a fatal accident by traveling back and forth through the time of a summer vacation, in order to alter the events leading to said accident.
info: http://en.wikipedia.org/wiki/Hourglass_of_Summer
The following tags are aliased to this tag: hourglass_of_summer (learn more).