Japan was in an uproar over global warming... but then, one year, the summer temperature suddenly stopped at a maximum of 31°C, just like in the old days. As the years passed, the temperature continued to drop... and eventually, Japan became a cold zone instead of a temperate one.

...One day.

It happened on a night when a cold day was about to end—it snowed. And it snowed incomparably more than usual, without stopping, without limit.

The world froze that day.

...In such a world, where will you and Natsume flee to...?

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This story is about how to survive in this frozen, Antarctic-like Japan.

...Or... if you want some excitement.
I also recommend uncovering Natsuki's secret. Ask plenty of questions, remember them, and in the end,

you will come to know everything about Natsuki.