In a middle school tournament he made it into the top eight.
District Preliminary arcEdit
Along side Kuze Sōsuke they attend the district preliminary bout between Onimaru and Sada Mizuki. Observing the match they discuss each individual's fighting style and the possible outcome of the match.
When Onimaru is declared the winner of the match, Kariya becomes stunned by the outcome.
Later on, Kariya is seen wandering around calling for Sōsuke, crying he doesn't want to left in a place he doesn't know. When Kuze calls him over Kariya notices he's talking with Oodachi High School, and tells him not to waste his time with people who couldn't win the District Preliminary. Kuze mentions Kariya doesn't mean it and he was moved by Ushio's match. Kariya calls his win a fluke. When Kariya is told to stop acting cool when they weren't picked to compete at their own District Preliminary. Starting to panic he says his and Kuze's names will echo in the entire country.
Kanto Newcomer Tournament arcEdit
When Ushio Hinomaru defeats Shimoyama Rinpei. Kariya confronts Ushio and mentions although he's smaller than him, he acts like he's using the techniques of large sumo and it pisses him off. Ushio mentions he's right and asks if his big friend will enter the tournament. Kariya responds by telling him he won't fight Sosuke and before that, he will fail against him.
Stood in the ring facing Satō, Kariya calls him a jumbo. During the match, when Satō goes for a two hand trust. He performs a low initial charge to avoid the trust and grabs his lioncloth. He then takes him down with a inside leg trip and wins the match. Now preparing to face Onimaru he calls his sumo an eye sore and claims once he loses he'll realize his choice was wrong and give up his sumo. Onimaru refuses and claims he'll win to which Kariya says Onimaru irritates him to no end.
When the match begins, Kariya charges at him lowing his stance below Onimaru's until being stopped and being brought level. As Onimaru begins to use thrusts against him, Kariya charges at him again from the side and uses a leg sweep behind him. Kariya tuns around to face him and then charges at him pushing him to the edge of the ring. Onimaru stops his movement and lifts him from behind.
While lifted Kariya, waits for the right moment to perform an outside leg trip. Stunned by Ushio not falling to the ground he tries to analyse his situation until being defeated by inner thigh throw. Backstage afterwards, Kariya claims his sumo isn't wrong and he will win next time. Agreeing with him, Kariya throws a lioncloth at him and asks if he will fight. Kuze confirms he will after a moments silence. Asked by Kariya if he's fighting for his revenge. Kuze declines and mentions he wants to fight in a formal match. Asked by if his blood was stirred up by Ushio, Kuze confirms.