Shiono is a student at Hiroshima Kureminami Technical School and a member of the Hiroshima Kureminami Tech Bicycle Club. His exact cycling type is unknown, other than that he is not a sprinter. He functions as a minor background character who appears on the third day of the 41st Summer Inter High. He's left behind after Arakita, Onoda, and Manami catch up to Hiroshima after breaking away from the pack, exhausting himself from pulling as he's not a sprinter.
Shiono appears taller than the rest of his teammates with a large, muscular body. He has short black hair and his head is rather oval-shaped. His face remains stoic and he has prominent upper eye-lids, giving him a perpetually bored look.