Roberto “Satoshi” de Souza will ring in the New Year in the ring…

The 33-year-old Brazilian mixed martial artist, Rizin’s lightweight champion, will fight in an ambitious Bellator vs. Rizin card on New Year’s Eve.

de Souza will fight Bellator star AJ McKee in the main event of the December 31 card at Japan’s Saitama Super Arena. That will be a nontitle matchup.

In the co-main event, it will be both promotion’s featherweight champions — Bellator’s Patricio “Pitbull” Freire and Rizin’s Kleber Koike Erbst — facing off in a superfight.

Also on the card, former Bellator and current Rizin bantamweight champion Kyoji Horiguchi will face Ultimate Fighter veteran Hiromasa Ougikubo, and former Bellator bantamweight champion Juan Archuleta will meet ROAD FC featherweight champion Soo Chul Kim in a bantamweight bout.

All the fights on the card will take place in a ring, rather than a cage, as is tradition in Japanese MMA. The bouts will be held under Rizin rules and not the Unified Rules of MMA, meaning kicks and knees to the head of grounded opponents will be legal. This card is the last addition of an annual big MMA event in Japan on New Year’s Eve.

De Souza (14-1), a Brazilian-born fighter who lives in Japan, has won five straight and is a Brazilian jiu-jitsu specialist.

Freire (34-5) is the greatest fighter in Bellator history, a three-time Bellator featherweight champion and former Bellator lightweight champion. The Brazilian MMA fighter has won nine of his last 10 fights.

Koike (31-5-1), a 33-year-old Brazilian-born fighter who lives and trains in Japan, has won seven straight and has 27 submission finishes in 31 career wins.