In a Kaiju-filled Japan, Kafka Hibino works in monster disposal. After reuniting with his childhood friend Mina Ashiro, a rising star in the anti-Kaiju Defense Force, he decides to pursue his abandoned dream of joining the Force, when he suddenly transforms into the powerful "Kaiju No. 8." An action-packed recap of the first season of Kaiju No. 8 and a new original episode, Hoshina's Day Off.

这是一个怪兽如日常般威胁人类的世界。日比野卡夫卡原本立志加入“日本防卫队”，却放弃梦想，在怪兽清扫公司工作。与他一同发誓“两人一起消灭所有怪兽”的发小亚白米娜已经成为第三部队队长大显身手，再加上遇到了想要加入防卫队的后辈市川莱诺，以此为契机，卡夫卡再次开始追逐梦想。