Koharu Tamai is a professional footballer from JPN and is currently 21 years old. He is on the books of AC Nagano Parceiro Ladies and wears shirt number 19. His main role on the pitch is Forward. He measures 160cm in height and weighs 56kg.

During the Women Empowerment League 2025-2026 campaign, Koharu Tamai made 13 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.