After losing the 5-part Workplace Competition to his corporate rival Gai Amatsu, Aruto secretly downloaded all of the Humagears' personality profiles from the Satellite There before they are erased so he can continue the Hiden legacy by creating a new company, . When the malevolent A.I. Ark arises to destroy humanity, Gai joins forces with Aruto to defeat it; making amends with him by relinquishing control of Hiden Intelligence and returning the company to him along the way. After Horobi destroyed Aruto's secretary, Is, however, the Ark's emissary As gives Aruto the Ark-One Progrise Key, turning him into the Ark's first human host and giving him the power to transform into Kamen Rider Ark-One to seek revenge while retaining partial control over himself. While fighting Horobi however, Soreo reminded him of why he became a Kamen Rider, which gave Aruto the resolve to purge himself and Horobi of the Ark's influence before letting him destroy the Ark-One system; reconciling their differences in the process.
