Former All Black Richie Mo'unga shrugged off a broken hand to extend his remarkable title-winning streak after leading Toshiba Brave Lupus to their second straight Japanese championship on Sunday.

The fly-half has finished every season in top-level domestic rugby since 2017 with a winner's medal and he picked up another as Toshiba beat Kubota Spears 18-13 in the Japan Rugby League One final.

He had to do it the hard way after breaking his right hand in the closing stages of last week's semi-final win, with coach Todd Blackadder expecting his star man was "70-30" to miss the final.