Mari Tamaki is a second-year high school student who wants to make the most out of her youth but is usually too afraid to do so.[6] One day, she meets Shirase Kobuchizawa, a girl who has been saving up to travel to Antarctica, where her mother disappeared three years ago.[7] Joined by two other girls, Hinata Miyake and Yuzuki Shiraishi, they join an expedition headed towards the Antarctic
