每天入夜，当春日部的居民们酣然入睡之后，他们都会来到一个神奇而又美丽的梦中世界中。在那里，他们可以实现一切想要实现的愿望，满足一切渴望满足的要求，这个梦中的世界充满了快乐和幸福。 某日，一个名为贯庭玉崎的女孩跟父母一起搬来了春日部市，成为了这个城市中的新的一份子。然而，从那一天开始，大家就再也没有做过美梦了。那个曾经温暖的梦中世界，如今充满了痛苦、悲哀和恐惧，而梦境中的灾难亦渐渐延续到了现实之中。这一切的发生，显然和玉崎有着脱不清的干系。为了弄清事件的真相，小新（矢岛晶子 配音）联手风间（真柴摩利 配音）和妮妮（林玉绪 配音）等小伙伴们展开了调查。
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