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Yuichi Aizawa was in the 2nd grade of a high school and happened to live in a snowy northern town because of his parents’ job.
Though he came back to the town after seven years’ absence, he couldn't remember the most memory about it somehow.
Through meeting with five girls in this town, an incident that occured seven years ago gradually became clear. Why Yuichi had lost his memory and what made him meet these girls?