Suntory fended off a stern challenge from Toshiba Brave Lupus to win the first semi-final 30-24 at Osaka on Saturday before the Wild Knights overpowered Kubota Spears 24-10 in the second semi in Tokyo on Sunday.
The two clubs have won 10 of the 20 championships in the Japanese Top League which was recast in a new format this year and rebranded Japan Rugby League One.
Next weekend's final reprises the decider from the last Top League when the Wild Knights beat the Sungoliath 31-26.
Sungoliath, whose challenge is spearheaded by midfield powerhouse Kerevi and All Blacks fullback Damian McKenzie are coached by the former Georgia coach Milton Haig.
The Wild Knights, featuring winger Koroibete among many stars, are coached by ex-Wallabies mentor Robbie Deans who can match his five Super Rugby titles as mentor of the Crusaders if his team wins again.
The Wild Knights will start the first Japan Rugby League One title match firm favourites after defeating their arch-rivals 34-17 during the qualifying rounds.
The Wild Knights enter the final on the back of one of the longest winning streaks globally in any professional sport, having won 31 consecutive matches in a run that dates to 2019.
Former England and Wales test stars George Kruis and Hadleigh Parkes, who joined the club after the 2019 Rugby World Cup, have yet to lose wearing a Wild Knights jersey, nor has Koroibete who joined this year. Kruis will retire after the final.
