100-man no Inochi no Ue ni Ore wa Tatteiru

Synopsis

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. When she suddenly gets help from a mysterious female magician, and wins.

(Source: Wikipedia)