The relationship between pop idols and fans is built on passion. Sometimes, that passion drives supporters to go ballistic on one another.

Self-proclaimed ¡°new kawaii¡± J-pop outfit Fruits Zipper with the Japan Racing Foundation this year to promote horse racing. As part of the campaign, its seven members appeared at Tokyo Racecourse in Fuchu for a post-race talk event on June 8.

Things got out of hand.