Okinawa Invitational 4 delivered a full day of high‑level grappling as elite grapplers from Japan, Hong Kong, Taiwan, the United States, Germany, and Brazil battled through a double‑elimination bracket for the inaugural 80kg championship. The event opened with explosive action from Ibuki Arimatsu securing a lightning fast 25 second submission to a breakout performance like 18 year old Indiana Keirn, who stepped in as a last minute replacement and shocked the bracket with two wins over seasoned brown belts. From technique to raw power, the mats in Okinawa showcased the best of international grappling.