Pirate, Kizaru, the Madness of War

One Piece + Build Your Own Team + Many Fruits, Fantasy Beast Species + You Must Have the Qualifications of a King

I am not born to be a king, but there is blood flowing in my bones that will not let me bow.

Looking for a Book That Allows You to Travel Through Time and Become a Yellow Ape or Obtain a Yellow Ape Template or a Sparkling Fruit.

I once read a book about traveling through time to become a yellow ape. The protagonist had a particularly high understanding of the speed of light, but I forgot what it was called. Are there any similar books now?

9 Points or Above, No Heroine, Extremely Dark and Cool Novel