Description
Kotaro Hyuga is a 23-year-old director of the Hyuga Corporation, born in 1994 under the zodiac sign of the Dog. He stands 185 centimeters tall, weighs 78 kilograms, and has blood type AB.

As the young heir to the corporation's presidency, he supervises the Chairman's "Marishi Machina" development project—a powered suit that uses artificial muscle fibers and an electronic interface to grant average individuals the physical abilities of elite athletes. He rides a personal MT-09 motorcycle.

His clearheaded and rational demeanor suits his high-stakes professional role, though he remains a solitary individual who trusts no one. The fates of three riders—Kotaro, Dan Amo, and Makina Mikage—become deeply intertwined. Kotaro initially pursues Dan, known as "Zebra" for his exceptional skill on Route 246, aiming to test the Marishi Machina against such natural talent.

A critical incident occurs when the Marishi Machina suit seizes control of Makina Mikage, forcing her onto the Shutoko expressway on an MT-07. Kotaro and Dan give chase, with Kotaro viewing the event as a chance to outperform Dan and validate his project. This confrontation leads to a revelation by Chairman Mitsukuni Hyuga regarding a past incident that claimed their parents’ lives.

Afterward, the three riders overcome the troubling legacies of their parents' pasts. They restart their lives on separate paths while strengthening their bonds. A year after the incident at the corporation’s underground testing facility at the foot of Mt. Fuji, their stories continue as the gears of fate interlock and move once more.

His hobbies include playing tennis.