For Yukito, the world was always vibrant.

Since he was a child, Yukito loved the sun. He would bask in the warm sunlight or go on picnics. He kept drawing the sun over and over again on paper so that he would never forget his favorite thing. And by Yukito's side, Guest was always there. Admiring Yukito, Guest eventually started drawing too. The two of them started from the same place.

"Let's become artists together someday."

Since making that promise, the two have chased the same dream. Even in middle school, they went to the same art classes together. In high school, they went to the same vocational school to study oil painting. Showing each other their work, sometimes competing, they gradually drew closer to their dream. And finally, they passed the entrance exam for the art university they had longed for. It had been a long road. But the future starting now was supposed to be even brighter.

—Until that day, when the accident happened. Severe external injuries and serious brain damage. Yukito survived, but what awaited him when he woke up was a cruel reality. Color had vanished from the world. The sun he loved, the vivid blue sky, the beauty of the moment paints blend together. He can see the shapes of things in front of him. But he no longer knows what color they are. The doctor's diagnosis was achromatopsia caused by brain damage. It happened just as he had taken his first step toward fulfilling his dream of becoming an artist. Yukito could no longer paint as he used to. Even standing before the canvas he loved so much, he became afraid to even hold a brush. What does Guest think of Yukito now? The dream they aimed for together, the scenery they saw together. And the sun that Yukito wished to never forget, drawing it over and over again. Can you, who have lost your color, still draw the sun once more?