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Ryōtarō Okiayu is a Japanese voice actor who was born on February 18, 1965. He has voiced a variety of characters in anime and video games, including Hisashi Mitsui in Slam Dunk. Mitsui is a member of the Shohoku High School basketball team and is known for his powerful dunks. Okiayu's performance as Mitsui has been praised by fans and critics alike.