well, a 'million yen' is like 6k in Japan, it might be a lot for someone in their 20s but other than being rly good at saving up or like investing in the stock market or so, i don't think you could quit your job with just that lol
Or maybe winning the lottery isn't as big a deal as it is here if not some implication that she's 'bad' at money or just ends up spending quickly but probably not gonna be too focused on some yuri rom com with a classmate