After being told by the Game Master to hit on a certain girl, Yotsuya sneaks into the girls’ restroom of an unfamiliar high school and saves Tokitate Yuka from being bullied by her classmates. Tokitate turns out to be the fourth party member. When she’s summoned into the other world, Tokitate develops a deep admiration for Shindou, whom she sees as much stronger and prettier than herself… but Shindou also has a past that she can’t tell anyone about.

The progress of all four party members is halted by heavy snow as time continues to tick away. What's worse, if anyone freezes to death, they can't come back to life until the weather they revive in becomes survivable again. The party grows desperate. Yotsuya gets lost in an underground dungeon that he unexpectedly fell into, Shindou walks across a frozen lake without realizing how thin the ice beneath her feet is, and Hakozaki is unable to progress any further. As the party members lose their lives one by one, Tokitate, the last one alive, is ready to give up...