SUPER RIZIN.4 takes place on July 27, 2025, at Saitama Super Arena (Stadium Version) in Saitama, Japan. The main event features Mikuru Asakura taking on Kleber Koike. The card also includes Naoki Inoue facing Ryuya Fukuda for the RIZIN Bantamweight title. Inoue, a 28-year-old submission expert, clashes with 31-year-old DEEP two-division champion Fukuda.