How many times do I need to modernize to become a Battleship?

Eh!? You know a way to become a Battleship, commander!?

Eh?

As long as my breasts are big?

Ufufufufu~

Uun? That's right.

Yamato-nee and Musashi-san also have them big huh?

Nee... Nee... How do I make them big? So I need to strip huh?