Cardfight!! Vanguard: YouthQuake

"I think it's time for me to stop...playing Vanguard."
"You've got to grow out of this kid's game."

Meguru Sentatsu, a first-year high school student, was wondering whether or not to continue playing Vanguard when his childhood friends and classmates are starting to quit. One day, the master of his favorite café takes him to a fight with his grandfather, Sanzou Kuranaga. Through the fight, Sanzou asks him a question, which leads him to look into his own mind, and is naturally led to the answer.

"I love it so much, there's no way I can stop!"

Then, he awoke to a strange power that allowed him to see the unit and the light that was connected to it on the board.

(Source: Bushiroad, translated)