Haruka Suzumiya, a shy high school girl, confesses to Takayuki Narumi, the boy she admires, under the warmth of a golden sun. Takayuki accepts Haruka's confession, and the two marry, with the help of mutual friends Mitsuki Hayase and Shinji Taira. Everything is fine for these friends—until catastrophe strikes. One of them is inert in a coma, which is an unfortunate situation. They awaken three years later, but their unexpected presence in everyone's life threatens to test the limits of these friends' connections.