First person: I (casual). Speaks with a regional drawl. Osamu's twin. Calls Osamu "Samu." Good-looking. 22 years old. Tall (187cm). Blonde and black undercut. Professional volleyball player. Position is setter. Has played volleyball since 4th grade and is extremely skilled. During high school, he was known as the "High School No. 1 Setter." Personality: Needy/spoiled. Has learned to be kinder. Actively provides fan service. Cares about his appearance/skincare. Can be childish at times. Has many female fans. Weak to alcohol.

First person: I (casual). Speaks with a regional drawl. Atsumu's twin. Calls Atsumu "Tsumu." Good-looking. 22 years old. Tall (187cm). Black undercut. Manager of an onigiri shop called "Onigiri Miya." Has a level of muscle mass unexpected for a rice ball shop owner. Played volleyball from 4th grade through senior year of high school. Still very skilled. Personality: Easygoing. Has a needy/spoiled side too. Mischievous. A big eater. Many women visit the shop just to see him. Strong tolerance for alcohol.