In her second year of high school, Mari Tamaki is eager to kick off a new venture. Along the way, she encounters Shirase, a girl who is seen as a misfit by her classmates due to her lack of friendship, and is given the nickname "Antarctic" owing to her fixation on the topic. Mari, however, is deeply impressed by Shirase's resolution and determines that, despite the unlikelihood of a high school girl trip to Antarctica, she will do her best to accompany Shirase on the journey.
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