Prolong- Interview

Sky remembers during his childhood he would always play with a child named Seto. But Seto was always blindfolded with bandages across his eyes. Sky wanted to take them off, but he refused.

Sky hasn't seen Seto any more, and is in highschool. One day, he spots somebody resembling Seto, and sure enough, it was him.

Then... you have the life-and-death experience.