Jun is the king of underground cardfighting.

When Miwa returns to ask Jun to leave Kai alone, Jun uses Miwa as bait to call out and duel Kai. He has Miwa tied up to the cardfighting table and put on a glove so Miwa sees their duel up close. Unlike his minions, Jun does not cheat in the cardfight. Despite his skills, Jun loses the cardfight to Kai.