Keiko Nadachi is a substitute weather-girl for Michiko Kawai yuankan.cc on J-TV. As a way of signing off, she hikes up her skirt and flashes her underwear at the audience. This move makes her an instant cult TV figure and a celebrity. Then Kaori comes back to work and an all-out war erupts between the two of them, with an old high school flame of Keiko's trapped in the middle.
“百武装展开！！” “HUNDRED”──那是能对抗袭击地球的神祕生物“蛮族”（Savage）的唯一武器。 主角如月隼人为了成为能够驾驭HUNDRED的武艺者（Slayer），进入海上学园都市舰“Little Garden”就读。
