TV-Series
Description
Asuma Mayuzumi is a second-year student at Saisei High School and a key member of its stride club. Standing at 172 centimeters and weighing 59 kilograms, he has a youthful appearance with bleached blonde hair, which is naturally black, and blue eyes. His birthday is December 24. Asuma is the younger brother of Shizuma Mayuzumi, a third-year student and the relationer for Saisei's team. He is a childhood friend of Reiji Suwa, the head of the Suwa family, as the Mayuzumi family's father works as a gardener for the Suwa estate.

Asuma has an outgoing, cheerful, and proactive personality that contrasts sharply with his older brother's more formal and reserved demeanor. He is described as someone who does not get bogged down by trivial matters and speaks in a casual manner, even forgoing honorifics with others. While he often appears laid-back, he is capable of becoming fully serious and focused when the situation demands it. Despite his confident exterior, a core part of his character is shaped by the pressure of being compared to his exceptionally talented older brother, Shizuma, whom he refers to as superhuman.

This feeling of living in a sibling's shadow is a primary motivation for Asuma and a central aspect of his personal narrative. He finds a kindred spirit in Riku Yagami from Honan Academy, who also struggles with the legacy of a highly accomplished older sibling. This shared experience creates an immediate bond between the two, and they develop a rivalry built on mutual understanding and respect rather than simple animosity. Asuma is often the one to encourage Riku when he doubts himself in the sport of stride, and their dynamic is a significant element of the story, with both frequently competing as leadoff runners.

Beyond his athletic pursuits, Asuma has a creative side, with a hobby of writing lyrics and composing music. He is a member of the in-universe idol group Galaxy Standard, where he typically handles performance duties such as dancing or rapping, though he will occasionally take on the role of main vocalist depending on the song. This activity adds another layer to his identity, even though he is noted for having a minimal stage presence that his teammates sometimes tease him about.

In his role as a runner for the Saisei High School stride team, Asuma is a formidable competitor. He possesses above-average speed and well-honed parkour skills, which are essential for navigating the urban relay race courses. He specializes in sprints, making him particularly effective as a leadoff runner. Furthermore, his knowledge of sport science and nutrition, likely shared with his brother, allows him to be technically proficient; he offers advice to Riku on improving his running posture and flexibility.

Throughout the series, Asuma's development is closely tied to his relationship with his brother and his rivalry with Riku. He strives to step out of Shizuma's long shadow and establish his own identity as a top-tier runner. His journey involves not just athletic improvement but also accepting the complex feelings he has toward his brother and forging his own path forward, supported by the camaraderie he finds with his teammates and his unique bond with his rival.
Cast