By my vague memory it is about an MC who goes into a school on an island where you have to be economically sufficient, make allies etc, basically, they're running a business instead of learning there, and you can't get out/graduate unless you make 1million or something like that
Ah, yeah, it does look similar, but it's not it I don't think Hmm, well, they basically have no way to money unless they earn it themselves, or make some kind of deals with other "clubs" (each one specialized in a specific thing afaik, and the MC has a hard time recruiting members because he offended the student council president lady at the first day if I remember right), I think the MC was left there involuntary by his father? (Not sure about this, he might have always wanted to attend, that part is very blurry lol, it's either one of the two tho)