My Brother In Spirit

Summary
Koji takes shelter in a ditch to escape a windstorm and contemplates his various encounters with Duskmon. He wonders why Duskmon would want to see his memories, then wonders if Duskmon is using him--or if Duskmon is him. Koji then notices that the storm has cleared and continues on. Meanwhile Takuya continues his search for Koji. Zoe, J.P., and Tommy return to the meeting place only to find that Patamon, Neemon, and Bokomon have wandered off as well. They debate for some time on what to do, but when they are unable to reach Takuya or Koji on their D-Tectors, they decide to wait.

Duskmon begins to feel tormented over the knowledge that Koji is his brother. Sensing that he may lose control over Kouichi, Cherubimon reminds him of how much his mother suffered. As Kouichi begins to feel angry and jealous, Cherubimon convinces him that Koji is the one responsible for their mother's suffering and that light is pain. Duskmon then slide evolves to Velgemon and begins to seek out Koji.

Meanwhile, Bokomon and Neemon search for Patamon, who has wandered off. When they find him, Patamon tells them he has something to show them and begins to fly away. As Bokomon follows, he (literally) bumps into Takuya, who still hasn't found Koji. Patamon then says he knows where Koji is and continues on, with the others following him. As Zoe, Tommy, and J.P. wait, they decide that they should do something and seek out Angler.

Velgemon finds Koji and attacks him. Koji fusion evolves to Beowulfmon and attempts to talk to Velgemon, but he only slide evolves to Duskmon and attacks again. When Beowulfmon asks him why he fights for evil, Duskmon reveals that he is Kouichi Kimura, Koji's twin brother. He explains that when their parents divorced, they were each taken by one of them, Koji with their father and Kouichi with their mother. He then reveals that their mother, whom Koji thought to be dead, is still alive. When Koji begins to believe Kouichi, Duskmon relents, but Cherubimon's influence over him makes him attack again. For a brief moment, Koji sees Kouichi in his human form and Koji lets his guard down. Duskmon then uses Deadly Gaze at a point-blank range and Beowulfmon reverts to Koji's human form. Duskmon then slide evolves to Velgemon and begins to use Dark Obliteration. Takuya arrives just in time to push Koji out of range and Patamon begins to use Boom Bubble on Velgemon (with little to no effect). When Takuya urges Koji to spirit evolve, Koji refuses, telling Takuya that Velgemon is his brother and that he won't fight him. When Takuya expresses doubt, Koji says that he's known Duskmon was his brother since they first met, but Cherubimon has been using him against them. Takuya then remembers his relationship with his little brother, Shinya. He then says he's happy for Koji and that all Kouichi needs is to be purified. Koji refuses, stating that he won't fight his own brother, but Takuya gets angry and says that Koji will fight because it's his brother and that it's the only way to save him. Takuya fusion evolves to Aldamon and begins to fight Velgemon. After some hesitation, Koji joins the fight as Beowulfmon and by combining his strength with Takuya, Velgemon is purified and the Spirits of Darkness are stored in his D-Tector. Kouichi collapses to the ground and Koji and Takuya approach him. Takuya recognizes him as the 'other Koji' he saw at the train station in Home Again, Takuya Returns and wonders how all of this happened.

Continuity errors

 * Although Koji receives Arbormon's spirit in this episode, it was not mentioned he had it in his D-Tector until Takuya and Koji's Evolution Revolution, although Duskmon had the spirit since From Dawn to Duskmon.

Dubbing changes

 * There is a small error in the dub when Takuya calls Kouichi by name, despite the fact no one has told him Kouichi's name yet.

Digimon references

 * Takuya references Island Of Misfit Boys when he says he thought Koji was an only child.
 * Takuya recognizes Kouichi from Home Again, Takuya Returns.