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.

Kimari and the others finally have their tickets to Antarctica. However, they'll need to go on a three-day summer training camp to learn the skills they'll need. In the mountains, they experience everything from lectures to field work, and meet the team commander, who seems to have a history with Shirase.

It's been several months since their training, and the girls' trip to Antarctica is drawing near. With Rin's help, Kimari manages to sort out her luggage, and in doing so, finds a game she borrowed from Megumi a long time ago. When she visits her friend to return it and talk about old times, though, Megumi doesn't seem to remember it at all...

When the girls are testing a video connection to Japan for New Year's, a few of Hinata's "friends" come calling. Hinata begs off, but seems distracted for the rest of the day. Shirase decides to get to the bottom of things.