Answer
The answer is Nakayama set a record for the most goals scored in a single game during the 1998 J.League season. On April 13, 1998, he achieved this remarkable feat in a match between Júbilo Iwata and Kyoto Purple Sanga, where he scored an incredible seven goals, contributing significantly to his team's 16-0 victory, the highest-scoring game in the J.League's history.