[[Category: chapters]] A Piece of His Heart is the fortieth chapter of the Yu-Gi-Oh! manga. This chapter was originally printed in the Weekly Shōnen Jump magazine in Japanese. Its first English release was in the Shonen Jump magazine. It has been reprinted in volume 5 of the tankōbon. [[Chapter summary::After defeating Seto Kaiba, Dark Yugi inflicts the "Mind Crush" Penalty Game and Mokuba tells the story of how Seto grew-up to be the way he is.]]