This work caught my attention a few months ago with the premise of having a 'realistic' economy based villainess type of story but as the story progress, it's getting more and more blatant with it classical liberal wish fulfillment bullshit
The original message of "I will save Japan lost generation by making the economy better" got turned into "how I exploited future knowledge to make profit for myself (and Japan) while screwing everyone else". The FMC basically just use her future knowledge to siphon America economic might to bail out Japan's economic burble while encouraging the worst aspect of America capitalist system. War profiteering, political corruption, racism, stealing personal freedom and privacy, every tricks in the book is fine as long as it's done outside of Japan.
Of course, the main character have to a be a super beautiful genius white girl from a rich and noble family that is only barely down on their luck right now cause of bad management by other people. It was totally easy to turn the ship around with future knowledge and a million dollar in seed capital. She was also super talent in singing and easily became an idol if her business fail.
To make the matter worse, to justify a world where the MC can be a blue blood noble in modern Japan, the author basically created an alt history where all other nations' agency is erased and the Allies just decided to give Japan everything they wanted in WW2 cause they surrendered earlier. Japan got to keep Manchuria, Japan got to keep the Zaibatsu, Japan beaten the Soviet and got stopped by the USA cause the Soviet got the A-bomb etc.
Finally, the books were pretty blatant about the anti communism message. The author have many characters in story repeating the same cliches "my country bad when it was under socialism, we are so rich now under capitalism, praise capitalism" or "communist stole my grandpa slaves, they were bad people".
The more I read the worse I feel so here is just my thought to easy my anger and grief of wasting time on such a piece of trash.
You forgot to count 0. The alien should write 4 as 10, not 4.