Japan's Yakuza hasn't been a thing since the U.S mafia was a thing. They have similar political influence these days; little to none. They've either all gone legit, gone into grey area markets (pachinko, porn, etc) or flat out folded. Many have actually gone white-collar, getting into internet start-ups and investing in the stock market.
Japan has cracked down on the Yakuza governmental/political corruption so much so, that it doesn't exist anymore.
Don't get me wrong, the yakuza exists, sorta, but not in the same way they existed back in the 1970s or 80s when they ran the show. Things have changed dramatically since.
Dream on. The Yakuza simply have not been paid off.