Tsutomu Goshiki, a first-year at Shiratorizawa Academy born August 22nd (Leo), stands 181.5 cm tall and weighs 69.5 kg. He plays wing spiker, wearing jersey number 8, and favors boiled flounder. His main volleyball focus is improving sharp cross shots, with a maximum jump reach of 328 cm. Physically, he has a tall, medium build characteristic of Shiratorizawa players. His features include black hair in a bowl cut, dark brown eyes, and matching eyebrows thinning at the ends. His default expression is a natural scowl with an intense gaze. Post-high school, his hair loses the side bangs, featuring a center part instead. Ambitious and hardworking, Goshiki craves recognition, often seeking validation after impressive plays by looking around, sometimes drawing reprimands from teammates like Kenjirō Shirabu. He takes immense pride as Shiratorizawa's designated "next ace," striving to outperform the current ace, Wakatoshi Ushijima, whom he views as both rival and inspiration. Despite outward confidence, he experiences self-doubt under pressure and overestimates his abilities, leading to critical errors. He responds enthusiastically to teammates, even when struggling to comprehend dialects like Coach Tanji Washijō's Miyagi accent, and is easily uplifted by praise, such as Shōyō Hinata complimenting his straight shots. Flashbacks suggest Goshiki was likely the ace and captain of his middle school volleyball team, receiving trophies and consistent praise for his height and reliability. Aiming to prove himself as Shiratorizawa's future ace during the Spring High Preliminary finals against Karasuno, Goshiki executes powerful straight shots but struggles with consistency, especially serving under pressure. After several errors, Coach Washijō reprimands him. Teammate Reon Ohira clarifies this signifies high expectations, bolstering Goshiki's resolve. Shiratorizawa loses, and Goshiki leaves the court in tears. Ushijima later entrusts the team to him during the third-years' retirement ceremony, moving him deeply. Months later at the First-Year Training Camp, Goshiki initially seeks payback against Hinata for Karasuno's victory but is disarmed by Hinata's praise for his line shots. He readily agrees to extra practice and critiques Kei Tsukishima's setting accuracy. He naturally assumes leadership, with peers following his initiatives. His playing style combines power and technical skill. His signature sharp straight shots earn him the nickname "sharp straight guy" from Tobio Kageyama. He desires to refine his cross shots but occasionally falters due to inexperience. His volleyball attributes are rated: power 3, jump 4, stamina 4, game sense 3, technique 4, speed 3. Goshiki maintains complex relationships. He openly challenges Ushijima yet respects him profoundly, competing in trivial matters like eating speed or running drills. Shirabu finds his pride irritating and often ignores him, while Satori Tendō and Eita Semi tease him. He values all upperclassmen equally, refusing to choose a favorite. His dynamic with Hinata shifts from rivalry to mutual respect after the training camp. Post-high school, Goshiki attends university and joins the V.League Division 1 team Azuma Pharmacy Green Rockets as a starting outside hitter by his fourth year, continuing his professional career alongside players like Wakatsu Kiryū.