What bustier looks best on thin girls?

Tokyo has sunk into the ocean, along with most of the world, during a land subsidence. Aika Sumeragi is a salvager who works for a small company run by a father and daughter tandem. Alas, the company isn't exactly successful, and money is needed desperately. Thus, Aika accepts the very dangerous job of acquiring Lagu for a hefty sum. The boss' daughter Aida Rion joins Aika on this particular mission, and the two set off. Later on, Aika and Rion are captured by Rudolf Hagen -- an effeminate but over-sexed man who wants Lagu and Aika (and just about every pretty girl) for himself. Hargen commands a huge battleship manned exclusively by droves of cute girls in mini-skirts (the source for what is often called "fan service"). Alongside Hargen is his obssessive sister Nena, who is jealous of Aika, as well as another salvager named Gusto, who's also after Lagu, and who has a crush on Aika. When Aika's special bustier is activated, she becomes a " superwoman" who can take on a whole armies by herself.