Kinnikuman: The Lost Legend (2021)

Sinopsis

In November, 2019, the planning and production of the live action version of the national hero manga "Kinnikuman", directed by Sono Sion, was in progress. "Kinnikuman" was said to be impossible to adapt but it's now said that it will be a great project. Maeda Gordon, while training at the gym, is contacted by the producer of "Kinnikuman", asking him to appear in the movie. However, there's a hidden past attached to this film and the actor begins looking into the mystery.