Movie
Description
Hailing from Nagoya, 14-year-old Ryūji Kiyosu joins the Shinkansen Ultra Evolution Institute's Nagoya Branch as a Shinkalion driver, becoming the eldest minor pilot recruited. His father, Chikuma Kiyosu, was a core developer of the Shinkalion project, mirroring Hayato Hayasugi's family background despite their contrasting personalities.

After his father's death, Ryūji shoulders responsibility for his family, caring for his ill mother and younger siblings, Tatsumi and Miyu. This duty forces him to abandon a promising karate career where he held championship potential. His decision to join the institute partly honors his father's dedication to the Shinkalion.

Initially piloting the Shinkalion N700A Nozomi, Ryūji later commands the Doctor Yellow unit. His maturity and discipline lead him to take charge during battles, often directing other drivers like Hayato. Early on, he restricts Hayato from frontline combat due to perceived poor skills, earning a reputation for inflexibility among younger pilots.

Ryūji's reserved nature gradually softens through interactions with fellow drivers and his family. He trains Hayato in karate, participates in group activities, and researches railways aspiring to become a director. This growth shows in his increasing adaptability during unfamiliar situations, though he occasionally struggles, such as in team-building exercises or railway quizzes.

By the second season, Ryūji's compatibility with the Shinkalion decreases due to aging, ending his active pilot career. He transitions into an institute executive role while working as a karate instructor. In this capacity, he mentors new driver candidates, notably the Anjō siblings—Shimakaze and Nagara—who later pilot the N700S Nozomi and Doctor Yellow units, respectively, echoing Ryūji's path.

His relationship with younger brother Tatsumi remains complex; Ryūji frequently reprimands Tatsumi's impulsiveness yet demonstrates deep familial loyalty. This dynamic reflects his broader interactions, where initial sternness evolves into a more supportive mentorship style, evident in guiding the Anjō brothers and training new drivers.