TV-Series
Description
Shun Kariya attended Eigadai Affiliated High School and belonged to its sumo club. His history with Hinomaru Ushio began in elementary school, where both were notably small for sumo wrestlers, fostering a mutual understanding that later evolved into rivalry. During elementary school, Kariya sustained a significant injury in a match against Sōsuke Kuze, an incident contributing to Kuze's years-long reluctance for formal competition; Kariya carried lingering guilt, believing himself partially responsible for Kuze's withdrawal.

By middle school, Kariya adapted his sumo style to compensate for his stature, relying on speed, technical footwork, and low-position attacks instead of direct force. This approach won him the amateur lightweight tournament championship and took him to the quarterfinals in openweight national competitions. His style emphasized evasive maneuvers and trips, like inside leg sweeps, to destabilize larger opponents, though he remained vulnerable to throws and counter-techniques targeting his sides.

In high school, Kariya maintained a competitive yet resentful relationship with Hinomaru, whose head-on approach contrasted his technical style. He openly criticized Hinomaru's sumo as an "eyesore" and aimed to defeat him to prove his methods superior. Their rivalry culminated in the Kanto Newcomer Tournament. After defeating an opponent named Satō with an inside leg trip, Kariya faced Hinomaru. He initially gained momentum with leg sweeps and pushes but was ultimately defeated by Hinomaru's inner thigh throw. Following the loss, he acknowledged Hinomaru's strength while vowing to improve, shifting from resentment to determined rivalry.

Kariya shared a close, protective bond with Kuze, often defending him against teammate criticism and supporting his ambitions. He recognized Kuze's burden as the son of a yokozuna and encouraged his growth, particularly during Kuze's matches in the Kanto Tournament. Outside sumo, Kariya exhibited traits like a severe lack of direction, fear of heights and ghost stories, and hobbies including manga reading, drawing, and collecting cicada husks.

Recurring injuries plagued Kariya's sumo career after high school. These physical setbacks eventually forced his retirement from the sport, a common fate among athletes who prioritized results over long-term sustainability. His development depicts a transition from a rival fueled by insecurity to a resilient figure who respected opponents while confronting his limitations.