After 21-year-old Chiaki watches his boyfriend, Kuon, die in a tragic accident right before his eyes, he suddenly wakes up to find himself flung ten years into the past! Now stuck in a child s body, he tries to convince Kuon that he s his future lover, but 28-year-old Kuon is a much colder and more pained man than the one he knew. But no matter how hard Kuon tries to push Chiaki away, Chiaki won t give up until, step by step, he works his way into Kuon s hardened heart once more...