Sakamoto first teamed up with composer Yoko Kanno in her 1996 debut single, " Yakusoku wa Iranai " ("Promises Not Needed"), which was used as the opening theme for the anime series The Vision of Escaflowne . Kanno collaborated with Sakamoto up until her fifth album, Yūnagi Loop , which has no songs composed by Kanno. Sakamoto also performed three songs for the series Wolf's Rain , for which Kanno was the composer: " Gravity " (which is sung completely in English), "Tell Me What The Rain Knows" (with lyrics by Chris Mosdell ) and "Cloud 9". She performed " Hemisphere ", the opening theme of the series RahXephon , as well as two songs for the series' theatrical version RahXephon: Pluralitas Concentio : " Tune the Rainbow " and "The Garden of Everything" (duet with Steve Conte ). In 2008, Sakamoto and Kanno collaborated again for " Triangler ", the opening theme song for the series Macross Frontier .  She also performed the song "cream" with HIDE , which was featured in the Ghost in the Shell: Stand Alone Complex mini album be Human . She was one half of the voice acting duo Whoops!! , alongside Chieko Higuchi .