Mari Tamaki, a second-year high-schooler, has spent years talking about seizing her youth without actually doing anything. Then she stumbles into Shirase Kobuchizawa, a girl saving every yen she earns to reach Antarctica, where her mother vanished three years ago during a research expedition. Joined by part-timer Hinata Miyake and reluctant child actress Yuzuki Shiraishi, the four secure spots on a civilian expedition ship heading south.