Career
Nagoya Grampus
Mochizuki made his official debut for Nagoya Grampus in the J. League Division 1, J. League Cup on 24 April 2013 against Kashima Antlers in Kashima Soccer Stadium in Kashima, Japan. He was subbed in the match in the 46th minute for Ryota Isomura. Koyamatsu and his club lost the match 1-0.
