How to quickly unlock Dragon of Dojima abilities?

I've managed to get max money (10 trillion yen) by losing to Mr. Shakedown and getting 1.5x my money back. Now I'd like to spend my yen on Dragon of Dojima abilities, but it takes over a minute and less than 30 billion yen to unlock the grid once. I should be able to get to level 333 at 30 billion a level, but it would take about 8 hours to do so. Is there any way to speed this process up?

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