Ruki Mochizuki is a professional footballer from JPN and is currently 17 years old. At international level, he features for Japan U15. His main role on the pitch is Defender.

Across the EAFF U15 Men's Championship 2025, Ruki Mochizuki appeared in 3 matches and averaged 0 tackles, 0 interceptions, 0 clearances, and 0 blocked shots per game.