"Dragon Ball Z, Vol. 20: The New Generation" include chapter 227 - 238.
Included chapters
Chapter 227
Tale 227 Herculopolis High
Chapter 228
Tale 228 Undercover
Chapter 229
Tale 229 A Hero Is Born!
Chapter 230
Tale 230 Videl's Emergency!
Chapter 231
Tale 231 Revealed!!!
Chapter 232
Tale 232 Strongest in the Heavens!
Chapter 233
Tale 233 Let the Training Begin!
Chapter 234
Tale 234 Videl Learns to Fly
Chapter 235
Tale 235 Fathers
Chapter 236
Tale 236 The Dragon Team Returns!
Chapter 237
Tale 237 The Preliminaries Begin
Chapter 238
Tale 238 The Two Little Warriors
Plot summary
Dragon Ball Z fast-forwards into the future! Years after the battle with Cell, the Earth has forgotten about the existence of the super warriors, and Gohan is living the life of a mild- mannered high school student. Mild-mannered until evil strikes,that is...and the world needs the power of the Great Saiyaman!As Gohan's high school classmates ponder the similarity between their classmate and the masked crimefighter, two even stronger warriors prepare to make their names known. Their names are Goten and Trunks, and though they're not even out of elementary school, they may be the toughest things on the planet.