During summer vacation, a boy named Kino heads to his friends' secret base to meet Nathan and Bill. While the three are spending time together as usual, they suddenly notice the temperature dropping dramatically. Stepping outside, they are astonished to find snow falling on a hot summer day. Determined to uncover the cause of this strange weather, the trio sets off on an adventure to find the source of the mysterious flurry. Their investigation leads them to a Snorunt, a small Ice-type Pokémon that is in clear distress and responsible for the unexpected blizzard. The friends must then figure out how to help the troubled Pokémon and restore the summer heat.