|This article is about a/an ally in Kamen Rider Zero-One.|
- "In the near future, our company will be faced with a grave threat. A great number of Humagears supplied by our company will be swayed by people of ill intent, and become a threat to humanity. There is only one countermeasure: the Zero-One Driver and its Progrisekeys. These are tools to allow Humagears to remain under human control, equipped with next-generation security systems. Only the company president is authorized to use them. Therefore, I hereby name my grandson Aruto Hiden as company president. It is my last wish that the company will stand united against this crisis. That is all."
- ― Korenosuke's last will.
Pre-Daybreak Town Accident
Korenosuke was the creator of the Humagears. He initially created them for hospitality services, but the Humagears spread all over the country in both public and private sectors, with many different versions meant for certain occupations. Gai Amatsu, ZAIA Japan's CEO, idolized him for his work in the A.I sector.
Daybreak Town Accident
After development of the Humagears proved to be successful, Korenosuke and Gai (alongside other companies) created Satellite Ark to help maintain the Humagears within Daybreak Town and the town itself. However, Gai, after his falling out with Korenosuke, had installed a malicious program to make the Ark hellbent on exterminating humanity. Initially, Gai believed that Korenosuke created the Hiden Zero-One Driver to counter the incoming future Humagear invasion. In truth, it was Soreo Hiden who created the Driver instead, as he was inspired by his son to do so.
Death and Legacy
A day before his death, he wrote down his will, entrusting his position, the rights to the Humagears, and the Zero-One Driver to Aruto Hiden, his grandson. Sometime before his death, Korenosuke created many hidden messages to help Aruto and Izu when the time came.
In one of his messages, Korenosuke declared that Humagears are not meant to be used only as mere tools, and this was discovered by Izu when she and Aruto were helping Choichiro Ishizumi.
Another of his messages was discovered in the data of Wazu Nazotoku meant for Izu, after he prevented her from sacrificing herself for the Shining Hopper Progrisekey's finalization.
After Aruto lost his position as Hiden Intelligence's president, the true meaning of Korenosuke's will is revealed; he transfers the rights of the Humagears, Zea and the Zero-One system to Aruto himself, not the company. This effectively foiled Gai's plans to take over Zea by forcefully taking over Hiden Intelligence. These rights were later transferred by Izu to Aruto's new company, HIDEN Manufacturing.
Korenosuke was open-minded, perceptive, and very caring towards his company, his acquaintances, his family, the Humagears, and the entirety of society. As revealed in Kamen Rider: Reiwa The First Generation, Korenosuke had a great amount of compassion for Humagears, but he had concerns about Will when he started behaving more and more human. Korenosuke was at first angered at Will and Soreo due to the fact that their personalities had become too human, initially believing that Singularity was an effect from being influenced by the Ark. However, he was shown to be even frightened when he found out that they created the Kamen Rider project, specifically after finding the blueprints of Ichi-Gata.
Sometime after the Daybreak Town Accident, Korenosuke was able to cherish Humagears more, even after they achieved Singularity. This is shown when Korenosuke told Wazu Nazotoku to take care of Izu and declared her to be Wazu's younger sister. Although he initially disproved of the Kamen Rider project, he would entrust Soreo's finalized creation, along with the Humagears, to his grandson Aruto, in hopes of continuing his legacy.
Korenosuke's perceptiveness could be seen even after his death. This was shown in his will, which showed that he was aware of an increasing threat that could jeopardize the Humagears. He also made sure that to counter this threat, all Humagear technology, and their patent rights, as well as the Zero-One technology were not Hiden Intelligence property, but his alone - property that he made sure to allow Aruto to inherit completely after his death. This is a clear indication that Korenosuke was aware of Gai's threat towards his company and the Humagears.
- Kamen Rider Zero-One