铃木朔实暗恋着隔壁班的美少女佐藤绚乃并在校内对她展开了各种疯狂的跟踪狂行为。 某日这些事情被绚乃察觉，发现还有另一个姓为「佐藤」的跟踪狂，朔实震惊了。所有姓氏为佐藤的人都被深深怀疑，朔实为了找出这个「佐藤」，为了让绚乃能安心地生活下去，做出了行动…

Teruo, Keigo, and Soryu, three curious elementary school children, encounter Mr. Sato, a wanted "child murderer" who has snuck into the abandoned school where they are playing to look for a time capsule.