Informational mini anime posted on the anime's official Twitter and HJ Bunko/HJ Novel's official YouTube channel.

Various characters from Go Nagai works including Devil Man, Mazinger, and Violence Jack, become trapped in a parody world where they all be come super deformed. They get trapped in this mishmash, fighting each other and are trying to figure a way back to their own world.

In a city filled with anthropomorphic cat-people, Catman lives free of rules and boundaries, doing everything he wants, which often collides with the other inhabitants of the city. Catman dares to be bold: it’s made in Flash, which is rarely seen nowadays; there are no spoken dialogue but instead is subbed in Japanese and English and has a original soundtrack made in purpose for the series.

The series follows the antics of tenth-grade student Eisaku Yazawa who wants to become a bousouzoku, a motorcycle gang member.