Release Artist Title Notes Album
2004 Hiroshi Itsuki feat. Rimi Natsukawa Deigo to Hanasu (デイゴとはまなす Talking with a Tiger's Claw Flower?) Onna no Ehon
2005 Chikuzen Sato with Rimi Natsukawa Boku no Mune de Oyasumi (僕の胸でおやすみ Goodbye with My Heart?) Features on "Rimits: Best Duet Songs" (2006) The Selection of Cornerstones 1995-2004
Rimi Natsukawa 'Aa Kōshien' Kimi yo Hachigatsu ni Atsuku Nare (「あゝ甲子園」君よ八月に熱くなれ You Make Me Hot in August (from Ah, Kōshien)?) Ningen Manyōka: Yū Aku Kashishū
Kaoru Kurosawa duet with Rimi Natsukawa Manten no Hoshi no Yoru (満天の星の夜 Night with a Sky Full of Stars?) Features on "Rimits: Best Duet Songs" (2006) Love Anthem
2006 Andrea Bocelli duet with Rimi Natsukawa Somos Novios (Ai no Yume) (ソモス・ノビオス~愛の夢 It's Impossible (Dream of Love)?) Features on "Umui Kaji" (2007) Amore (Japanese Edition)
2008 Taiyo Yamazawa presents Rimi Natsukawa Utabito (歌人 Singer?) Music Tree
2009 Chage with Rimi Natsukawa Boku wa Dō Kana (僕はどうかな What Should I Do?) Many Happy Returns
Rimi Natsukawa Tada Sore Dake (ただそれだけ It's Only That?) Katsuhisa Hattori