In the warmth of a golden sun, timid high school student Haruka Suzumiya confesses to Takayuki Narumi, the boy she admires. Takayuki accepts Haruka's confession and the two become a couple, supported by their mutual friends Mitsuki Hayase and Shinji Taira. All is well for these friends—until tragedy strikes.

One of them is sent to an unenviable fate, lying dormant in a coma. Three years later, they awaken, but their sudden reappearance in everyone's lives threatens to test the limits of these friends' bonds.