After being rejected by her high school love interest because of her small breasts, Masako takes up the identity Big Boobs Buster. A busty masked vigilante who plans to right the wrongs and avenge all the flat chested girls by taking down all those who think they can do whatever they want and seduce whoever they want with their large boobs.
Why is it that I'm not surprised that the Japanese are the ones who managed to produce an "erotic" version of a superhero-vigilante? "Big Boobs Buster" is a very strange movie, and I have to admit, I kinda lied in the plot description. The "Big Boobs Buster" plotline actually has very little to do with the movie. Yes, early on the movie is about how a small chested girl named Masako, steals a disk that contains a database of all the big breasted girls in her school, created by a perverted old man who's never identified. Masako takes this list and attacks the girls, makes molds of their busts and threatens if they don't stop seducing men with their tits, she'll parade their busts around town. This is essentially what you would believe and is what the distributors want you to believe the movie is about, but it's not. And no, I'm not joking either.
That part of the storyline makes up probably about 20 or so minutes of the movie. Instead what "Big Boobs Buster" really is, is a coming-of-age story that feels like an after school special. A very perverted after school special. Masako is blackmailed by the top female track athlete into running for the school or have her identity as Big Boobs Buster revealed. So then next 40 minutes become about Masako training for her big track meet, which can only mean one thing: montage.
Yes, montage. The classic 80's style training montage of a person starting out weak and becoming stronger and stronger over a collection of clips with cheesy music playing in the background. Of course the big track meet comes, Masako wins and her rival that she raced teaches Masako that with dedication, perseverance, and continuous training that she too will can finally have a big bust. That's it. That's the movie.
Yes, I know, disappointing as I too would have preferred the very ludicrous storyline about a masked-avenger attacking women simply because they have big boobs. Instead, we get a very silly and very strange moral tale about working hard to reach your goals. When I say silly, I mean silly as in the entire movie is meant to play for laughs. (Translation: The movie is quite stupid.) If you're concerned about nudity, don't be, there is still plenty of bare chested girls running around in the movie. Just don't expect total smut insanity with "Big Boobs Buster".