Sai Otsubo is a 29-year-old professional football player from JPN. He currently plays for AC Nagano Parceiro Ladies, wearing the number 18 shirt. He plays primarily as a Forward. He stands at 154cm tall and weighs 54kg.

In the Women Empowerment League 2025-2026 season, Sai Otsubo scored 0 goals and provided 0 assists across 9 appearances, averaging 0 goals per game with 0 shots attempted and 0 on target.