Read more about NEO (Digimon) at: Wikipedia

Official Site: Shueisha

is the second Digimon manga to be printed in the pages of V-Jump magazine, starting on December 17, 2005. Its main purpose is to promote the Digimon virtual pet (V-Pet) toys. The main character is called Tsurugi Tatsuno and is partnered with a Greymon (later Agumon). Tsurugi makes contact with the Digital World through his Digimon Mini virtual pet device and a "Battle Terminal", a virtual reality interface. Digimon can use the technology to materialize in the human world as well.

It seems to share a few key elements with Digimon Data Squad, such as the use of Digisouls, Agumon's evolution to GeoGreymon in chapter five and the appearance of Tsurugi's Digivice iC when Piximon upgraded it in chapter four.

Tsurugi Tatsuno is a boy who competes in Virtual Digimon Battle tournaments. When a Kuwagamon appeared in the Real World, his Greymon came to life and protected him. Tsurugi is summoned to the Digital World by Piximon to save the Digital World from the evil Barbamon. Since his Digimon has a hexagon shape on him, it's an Illegal Digimon, meaning that Digimon bearing such symbols can help save the Digital World. Tsurugi's Greymon later De-Digivolves to Agumon and they meet other characters destined to save the Digital World from the forces of Barbamon. Now they must stop Barbamon and his minions before they get all the DigiMemories and take over both worlds.

:Tsurugi Tatsuno was originally partnered with a Greymon. However, in a battle against Peckmon, Piximon De-Digivolved Greymon to the Rookie level - Agumon. Agumon later gains the ability to Digivolve into GeoGreymon. Later, when Tsurugi and GeoGreymon were fighting Shou and Yatagaramon, GeoGreymon gained the ability to digivolve into RiseGreymon. Now, in the System World, after Tsuguri receives the Digivice Twin R, RiseGreymon has digivolved into VictoryGreymon. After defeating NEO, he is turned to stone and reborn as a digi-egg.

NEO (Digimon) has not been a contender in any CBUB matches.