Mazinkaizer SKL (マジンカイザースカル Majinkaizā Sukaru?) is a Japanese OVA spinoff of Go Nagai’s Mazinkaiser, which was in itself a spinoff of Mazinger Z. The first episode was released on November 27, 2010 and was first screened on November 27, 2010. It also has a novel adaptation serialized in ASCII Media Works’ Dengeki Hobby Magazine and a manga adaptation published in the mobile phone magazine Shu 2 Comic Gekkin. Like Shin Mazinger Shougeki! Z Hen, characters and references to other works of Go Nagai appear in this series.

Schoolchildren Norimichi, Yuusuke, and Junichi want to know if fireworks look round or flat from the side. They make a plan to find the answer at a fireworks display, while Nazuna schemes to run away with Norimichi or Yuusuke, whoever wins at the pool.