Kotaro Suzuki
On June 10, 2003, Marufuji made his debut for New Japan Pro-Wrestling (NJPW), teaming with Kotaro Suzuki to unsuccessfully challenge Jyushin Thunder Liger and Koji Kanemoto for the IWGP Junior Heavyweight Tag Team Championship. Marufuji returned to the company on December 9, failing in his attempt to win the IWGP U-30 Openweight Championship from Hiroshi Tanahashi. On May 3, 2004, Marufuji would make his final appearance for NJPW in over five years in a six-man tag team match, where he, Heat and Tiger Mask were defeated by the American Dragon, Koji Kanemoto, and Último Dragón.