1998

Singles

 * January 28: Morning Coffee - Morning Musume
 * February 15: Sotsugyou ~TOP OF THE WORLD~ - Heike Michiyo
 * May 27: Summer Night Town - Morning Musume
 * July 1: Daikirai - Heike Michiyo
 * August 5: Karasu no Nyoubou - Nakazawa Yuko
 * September 9: Daite HOLD ON ME! - Morning Musume
 * October 25: Dakedo Aishisugite - Heike Michiyo
 * November 18: Last Kiss - Tanpopo
 * December 2: Odaiba Moonlight Serenade - Nakazawa Yuko & Takayama Gen

Albums

 * March 25: Teenage Dream - Heike Michiyo
 * July 8: First Time - Morning Musume
 * December 12: Nakazawa Yuko Dai Isshou - Nakazawa Yuko