|Human Partner||Doumoto Kouta|
Alphamon: Ouryuken (with Ryudamon)
DORUmon is the Partner Digimon of Doumoto Kouta, first encountering him on the Versandi Terminal. The two repeatedly clash with Okuwamon who desires DORUmon's X-Antibody. War Greymon (X-Antibody) saves them, allowing DORUmon to evolve into DORUgamon, then into DORUguremon and DORUgoramon.
Later on Versandi, Kouta and DORUgoramon are confronted by Omegamon (X-Antibody), who had been sent by Yggdrasill to delete all Digimon with the X-Antibdy. DORUgoramon is easily defeated by Omegamon (X-Antibody), but mutates and undergoes Death-X-Evolution to become Death-X-DORUgoramon. DORUmon becomes seperated from Death-X-DORUgoramon, reverting to Child stage and causing Death-X-DORUgoramon to evolve further into Death-X-mon a lifeform similar to a Digimon but without a Digicore that flees from Omegamon (X-Antibody).
The reborn DORUmon gains strength under Kouta, who re-raises him until he evolves into Raptordramon, a Digimon stronger than DORUgamon was, but with a highly aggressive personality. While fighting against a Kuwagamon army led by Grandis Kuwagamon, Raptordramon evolves into Grademon.
In the final confrontation with Death-X-mon, Grademon had evolved into Alphamon. Ouryumon sacrifices itself to protect Alphamon from a blow from Death-X-mon, and Alphamon collects the dying data of Ouryumon that transforms itself into the Ultimate-Battle-Blade-OURYUKEN, which allows Alphamon to become Alphamon: Ouryuken and defeat Death-X-mon.