Mori grew up in Tokyo, Japan, and often played music in high school with the members of the rock band Yonin Bayashi.
[2] While witnessing David Bowie's theatrical performance at Shibuya Public Hall in 1973, Mori thought rock music to be reminiscent of kabuki.
[5] In 1996 he worked on the first solo single of another X Japan member, "Meikyuu no Lovers" by Heath, which was used as the second ending theme of the long-running Detective Conan anime.
It was followed by Poetic Evolution in 1999 which in addition to Imai also featured Teru, Takuro and Hisashi of Glay, Takuya (Judy and Mary) and Kyoji Yamamoto of Bow Wow.
[9] Mori also wrote the lyrics to its second opening theme, 2017's "Genkai Toppa × Survivor", a rock song by enka singer Kiyoshi Hikawa with music composed by Takafumi Iwasaki.
[11][12] Mori wrote the script for the 2012 rock opera Psychedelic Pain after being convinced to do so by his friend Tomoyasu Hotei, who served as musical director.