A one-shot pilot manga, involving battles between more-or-less holographic Digimon. However, this manga was published as a special in volume two of Digimon Adventure V-Tamer 01, where an omake page by the author explained that the hero of this manga, Kentarou Kamon, was the source and inspiration for the design and character of Taichi Yagami, the protagonist of V-Tamer 01. 
Note: Published in Akamaru Jump 1997 Summer

In this universe, Taichi is involved in a V-Pet tournament, where he is told he cannot play because the Digimon in his V-Pet isn't recognized as being a real Digimon. However, after the tournament is over, Taichi plays the winner of the tournament, a boy named Neo Saiba, and their battle ends in a tie - something that is supposed to be impossible. Later, Taichi is summoned to the Digital World by a digimon called Lord HolyAngemon, and there he meets the mysterious Digimon in his V-Pet, Zeromaru the Veedramon. (Source: Wikipedia) 
Note: 
- Includes the one-shot "C'mon Digimon" (C'mon デジモン) 
- Includes the one-shot "Double Tamer!! Choujikuu Taisen!!" (ダブルテイマー!! 超時空大戦!!) 
- Includes the one-shot "Frontier Generation" (フロンティア ジェネレーション) 
- Includes the one-shot "Nekketsu!! Kirakira Taisen" (熱血!! キラキラ大戦!!!) 
- Includes two extra chapters.

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