Follow the friendship between the Nobara family’s pet dog Shiro and a “small dinosaur”. Their connection helps the growth of Shinnosuke and the Kusakabe Defense Squad.

One day, a woman named Chiyome Hesogakure with a child named Chinzō visits the Nohara family and claims that she is the real mother of Shinnosuke and takes him away…

When the five visit a private academy, Kazama is attacked, and left with reduced intelligence and strange bite marks.

The kingdom that floats above in the sky, that uses free doodles as an energy source, “Rakuga Kingdom.” However, now in the face of a lack in energy, they are…