Hajime and Shun meet at Shibuya's scramble crossing, and in that instant, their fates become intertwined. Though they've just met, Shun feels inexplicably drawn to Hajime and chases after him. In a narrow alleyway, they suddenly share a passionate kiss, rapidly deepening their connection. Meanwhile, one year earlier, Shun was still living happily with his boyfriend, Shuu. The two lovers made love daily, and after another round of their usual intimate sex, Shun falls asleep. When he wakes up, he finds a note left behind with just the words "Goodbye"! Shocked and heartbroken by the sudden breakup, Shun is now led toward a new encounter—one that will profoundly change the course of his life.