在21世纪突然出现了一种巨大的昆虫，被他咬过的人会换一种奇怪的疾病，叫做卡加斯特尔，人类一旦受到这种虫子袭击，就会变得失去理性，变得疯狂起来
当人们逐步发现这虫子的危害之后想要驱除他们时，却发现全世界的人口已经有大部分都已经被这些虫子全部给吃了。随着卡加斯特并爆发30年以后一个驱除专家木藤在这个时候深入虫子的巢穴，然而在巢穴附近，他却发现了一个即将死去的男人而这个男人将自己的唯一的女儿托付给木藤，那个女孩的名字就叫做伊利，因为父亲的去世，导致伊利茫然失去意识，一直不肯离去，被木藤打醒之后，两人开始回到人类的世界，新的故事从两人相遇开始便已经揭开了新的序幕，两人的出现也将改变人类的世界。
In the 21st century, a huge insect suddenly appeared, and people who were bitten by him would suffer from a strange disease called Cargast Well, once human beings are attacked by such bugs, they will become irrational and crazy
When people gradually discover the harm of this bug and want to get rid of them, they find that most of the world's population has died All eaten by these bugs. Following the outbreak of Cargast 30 years later, Muto, an extermination expert, went deep into the nest of bugs at this time, but near the nest, he found a man who was about to die, and this man entrusted his only daughter to Muto, The girl's name was Yili. Because of her father's death, Yili lost consciousness and refused to leave. After being woken up by Mu Teng, the two began to return to the human world. The new story began when the two met. A new prelude has been opened, and the appearance of the two will also change the human world.
独特的故事设定和扣人心弦的剧情使《虫笼的卡伽斯特尔》成为一部令人难以忘怀的作品。这部电影以未来世界为背景，揭示了科技和道德之间的冲突，引人深思。角色的发展与复杂的情感关系给观众带来了紧张和感动，让人对人性和社会问题有了更深入的思考。
《虫笼的卡伽斯特尔》展现了精湛的动画技巧和细腻的绘画风格。场景的细节和色彩的运用都非常出色，使得整个世界栩栩如生。动作场面的刻画充满力量和动感，让人沉浸其中。音效和配乐也与故事情节相得益彰，增强了观影体验。
该片的声优阵容强大，细谷佳正、花泽香菜、花江夏树和樱井孝宏等优秀的声优为角色赋予了生动的声音。他们的表演充满了情感和张力，让人对角色产生共鸣。每个角色都有自己独特的个性和故事，声优们的演绎使得这些角色更加立体和鲜活。
