Sai Otsubo is a professional footballer from JPN and is currently 30 years old. He is on the books of AC Nagano Parceiro Ladies and wears shirt number 18. His main role on the pitch is Forward. He measures 154cm in height and weighs 54kg.

During the Women Empowerment League 2025-2026 campaign, Sai Otsubo made 9 appearances, scoring 0 goals and adding 0 assists. He averaged 0 goals per match from 0 shots, with 0 on target.