Review Detail of Bumbum420 in One Piece : My Revenge

The story was going rather well for a while, however after the one-piece arc, the author messed up the story too much. He went to Naruto verse yet the fight between Naruto vs Pain was around 50 or more chapters. during the Naruto arc, the author made the mc retarded person. He is always passive and never ends the conflict regarding him. 1 conversation = 1 chapter, and never a progressive approach got into the Naruto arc. ready one piece arc then that's it for you readers.