Kadokura is the director of the development of "Paradigm X". Alongside Nishi he first appears in Paradigm X's Airvision during a news report where he describes Paradigm x as perfect. He apparently had an argument with Masahiro Sakurai in the past, but the details of this are unknown.
He actually wants to use Paradigm X and Manitou to ascend to godhood, and developed the Krypto Chip as a mechanism of harvesting souls through the Internet. When the Spookies attempted to leak documentation behind the Krypto to the public, it was intercepted and instead a news bulletin declared the Protagonist, Yu-ichi, Six, and Lunch as wanted cyber-terrorists by the city government. Thereafter, Kadokura sent a message to the HQ, falsely claiming that Sakurai had helped exposed the others as terrorists - this results in a schism within the group.
Shortly thereafter, Spooky attempted to upload a virus intended to sabotage Algon's network, only to be intercepted at the last moment by Kadokura himself, who taunted Sakurai. At this point the network began to become unstable due to Malsumis manifesting, with Kadokura's last words mentioning he "lost control again" and asking Finnegan for help.
Later, after Nishi had taken the other members of the Spookies hostage, the protagonist and Nemissa confront Kadokura in person at a meeting room in the Amami Monolith. Seemingly shaken, the Algon Soft president feigns no knowledge of the Phantom Society's goals and insists that he only wanted his network to connect others. However, after Nishi and Satanael are defeated and the broadband antenna on the roof is destroyed, a furious Kadokura appears and angrily rants that he only wanted Azazel and Satanael out of the way, and begins ranting that Manitou needs more souls.
After all this, a strange organic foam begins to manifest in the Nikamimon district around the Monolith, seemingly intent on creating a replacement antenna to connect Paradigm X to the rest of the Internet and continue harvesting souls for Manitou. Deep within the ruins beneath the district, the protagonist and Nemissa discover the site where Manitou was housed. They are confronted by Kadokura, who is absorbing power through the souls and transforms. Upon his defeat, he fuses with Manitou, which directly engages the party.