Time rewinds to Kakeru and Yamato's elementary school days, when they first met each other. While their personalities are near-exact opposites, they grow closer with each day they spend together. Soon, Kakeru learns more about Yamato--that his father fell into a coma after an accident, and even about a certain secret that he's hiding...
Please, may the little light in Yamato never go out. Childhood best friends. Two halves of a whole. Yamato and Kakeru. The clock has rewound to their elementary school days as a carefree Kakeru tries his hardest to befriend the quiet and reserved Yamato. But as they get closer, Kakeru soon realizes Yamato is keeping something buried deep within--a secret related to his father, who is now in a coma. With Kakeru at his side, can Yamato finally face the feelings that have been haunting him?