In Japan, where the appearance rate of monsters is second to none. Monsters relentlessly ravage the country and trample on people's daily lives.

Kafka, the protagonist who once aspired to be a member of the defense team, and is now engaged in the monster cleaning industry, began to become a monster one day because of the influence of mysterious creatures.
The Japanese Defense Force, which is responsible for the crusade against monsters, calls him "Monster No. 8".
The eponymous meme coin K-A-I-J-U has been launched on the Ether chain for the first time and is known as the first coin of anime meme.