Kleber Koike chokes out Mikuru Asakura in 2021 | Photo via RIZIN Mikuru Asakura is one of the biggest stars in Japanese MMA in recent years, and Kleber Koike wants to once again ruin his night at RIZIN. The Brazilian fighter, although a former champion in KSW, was not a known commodity when he joined RIZIN in 2020. Asakura, already 8-1 in the promotion at the time, was left unconscious when he met the jiu-jitsu ace in the main event of RIZIN 28 at the iconic Tokyo Dome.