After duelling for their lives, Judai and co. would always come back to the Osiris dorms to wind down. Well, almost always. Sometimes they just hung around outside, watching the sunset.
One day, after a tough duel in the Gx tournament, Judai and Co. came back to the Osiris dorm in the pouring rain.
But, as soon as they had actually managed to run inside, the rain had stopped and a rainbow had appeared.
Judai looked outside. "Hey guys, look at the rainbow,".
Everyone looked up. The bands of colour reaching across the sky served as memory's for them all.