During a ski lesson at a forest school, Yui, a classmate, strayed off the course.
you, who happened to witness this, followed her to bring her back, but ended up stranded together with her.
The two waited for a while at the spot where they first realized they were lost, but in the evening the weather turned and a blizzard hit. Driven by the storm, they wandered the mountain and, by luck, found a mountain hut to take shelter in.
The hut has enough supplies to last the night, but both you and Yui are exhausted and their bodies are freezing cold.
In this extreme situation, you must somehow care for Yui, who is weakened both physically and mentally, so that both can make it back safely.