Is there a duel?

Then maybe just as You Yu’s previous guess, the so-called “seven rounds” of battles means solving within seven rounds?

However, if you follow the real card guys' understanding of this game and want to pursue a quick battle and decision, let alone seven rounds, the game may be over in two rounds.

Then maybe what is outstanding about the opponent in this trial?

You Yu opened the duel plate while thinking.

"duel!"

【Yu Yu, LP 4000】

【Trial opponent, LP 16000】

You Yu:"

OK, he understood.
Chapter completed!