Mari Tamaki, AKA Kimari, really wanted to have a great adventure in high school, but could never take the first step. Now in her second year, she meets Shirase Kobuchizawa, a girl who is determined to go to Antarctica despite being told it's impossible. Kimari is so moved by Shirase's indomitable spirit that she vows to go to Antarctica with her.

To get on a ship to Antarctica, Kimari and Shirase will first need the money to fly from Japan to Fremantle, Australia. To earn this money, Kimari gets a job at a convenience store, where she meets a girl named Hinata Miyake. Hinata decides to join them on the trip, and quickly gets swept up in Shirase's next plan...

Kimari, Shirase, and Hinata need to figure out a way that high school girls might be allowed to go to Antarctica. Although dubious about their chances, they quickly find a report about a high school-aged actress named Yuzuki Shiraishi, who's being allowed to come along. Shirase attempts to make contact with Yuzuki's agency, but it just so happens that Yuzuki has come to them.

Ever since her mother was lost in Antarctica, Shirase has felt like she was lost in a terrible dream. Despite her fear of what will happen if nothing changes after she goes, she and her friends now set off on their final journey to the place where her mother was lost.

Kimari wakes up to the sound of her alarm and goes through her duties for the day. The girls have gotten used to their lives in Antarctica, but the summer team will have to leave in three days. Their journey of a lifetime is reaching its end.