Rizin FF 13 takes place on December 31st at Saitama Super Arena.
"It wasn't easy to make this happen", a subdued and polite Mayweather said.
"We will just see".
There's a long history of fighters, especially boxers, extending their careers long past when the likely should have - see: Jones Jr., Roy - but Mayweather is going in a new route with his post-initial retirement fight tour as he's taking the big check to take on fighters from other disciplines.
Mayweather's last bout was in 2017 when he beat Conor McGregor, running his boxing record to 50-0 and earning close to $300 million.
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"As far as the weight class, we're not really anxious about that".
Nasukawa, who is unbeaten in 27 kickboxing fights and four MMA bouts, has won various titles in the flyweight (125lb) and bantamweight (135lb) divisions, which raises obvious questions about the contracted weight for the fight: Mayweather hasn't fought below the 147lb division since his 2005 fight with Arturo Gatti.
Floyd Mayweather has some more fight left in him. "I will speak with my team and I will let my team get with Rizin and I'm pretty sure they'll come up with a great idea, but it's all about entertainment and that's what we want to do for the people".
"I have fought in the US for all 50 of my fights".
Rizin chairman Nobuyuki Sakakibara, who used to run the now-defunct Pride Fighting Championships promotional company, said they were still working out some of the details.
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Sarri also announced that he wants to keep Ruben Loftus-Cheek , amid rumours of a January loan move, in the same press conference. "Probably he will be able to play for 40 to 45 minutes".
Mayweather and Nasukawa appeared at a Tokyo news conference overnight that was streamed worldwide on YouTube and organised by the Rizin Fighting Federation, a Japanese fight company which promotes MMA and kickboxing events. Are you excited to see it? "I'm so happy that Mr. Nasukawa accepted this offer in a flash".
"I can wrestle, I can wrestle little bit".
He said: "It's the biggest moment in my life and I want to be the man who changes history".
"Just for me to be in the ring with a young guy that is hungry ..." "Boxing rules I wouldn't mind".
"I wanted to do something different".
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The rules of the fight are still being worked on, according to ESPN's Ariel Helwani.