A professional competitor since 2006, he has also competed in Shooto, RIZIN, Vale Tudo Japan, DEEP, and World Victory Road.
He fought almost exclusively for this company for four years up to 2010 and - including a fight for World Victory Road - amassed a record of 7 wins, 3 losses and 3 draws during this time.
[4] Ishiwatari competed in the rest of the Bantamweight Grand Prix in December 2017, fighting three times over two days.
Ishiwatari faced Naoki Inoue in the opening round of the Bantamweight Grand Prix at Rizin 28 on June 13, 2021.
[10] After suffering the loss in the Grand Prix, Ishiwatari announced that he was retiring from MMA, mainly due to neck injuries.