Mariko's 30 Pirates (2005)

While writing his final paper at university, Tetsuya Mariko finds out he is a descendant of pirates. He then dresses as a pirate, gathers some other 30 pirates around him and starts a campaign against the university, which is attempting to tear down a building he has grown fond of.

Unfortunately the movie Mariko's 30 Pirates is not yet available on HBO Max.