Kaoru Kino was a surgical genius, but a snow-mountain accident would ruin his career and claim the life of his younger brother, Masato. The accident also left his right arm with severe frost bite, which left surgeons no choice but to amputate and graft the arm of his deceased brother. The incident ultimately resulted in Kino's surgical license being revoked. From then on, Kino would suffer psychotic episodes stemming from the traumatic event. Kino was also one of the passengers aboard the “Akatsuki” and among those awakened by the "Overlord of Light". Over time, his powers would "evolve" into Another Agito. But given his unstable mental condition, he would eventually became corrupted by his newfound power, and soon became convinced that he alone was all that was needed to defeat the Lords. His delusions of grandeur ultimately motivated him to try and eliminate the real Agito. Though the actions of his brother's arm would occasionally interfere, it wasn't until his defeat at the hands of Kamen Rider Gills Exceed that humbled Kino. From that point on, he would aid the other Riders, even after the Overlord stole his power.

He later performed a small surgery on Shoichi in attempt to remove the quill of Ericius Liquor from his body, during this Kino's admitting that he become corrupted not because of the Agito power fault, but rather his own weakness as a human being. After that Kino able to recover his power thanks to Shoichi and help the group defeat the Ericius Liquor. After the fight, Kino goes into a coffee relax time with both Majima and Ryo, and encourage Majima that he can become a Doctor before finally dying from the injuries sustained by Falco earlier. However he died with a smiling face, after dreaming on being able to save his brother during the snow-mountain accident. As Another Agito, he is an exceptional locust-looking flawed form of Agito similar to Gills with fantastic physical prowess. His finisher is the Assault Kick which draws the power of Agito, emanating beneath his feet, into his legs, Another Agito can perform a high-powered flying kick that smashes into the enemy with colossal force; possesses approximately 40 tons of force. While extremely well versed in physical combat and physically powerful, Another Agito is the least versatile than the other Riders, having only one finishing move and no alternate forms or evolutions.