Like Little Devil Parade, Leo-Nine features a wide range of contribution from composers and producers, including long-time collaborators Pablo (Pay Money to My Pain), Ryo Eguchi, Koichiro Takahashi, and Shota Horie.

[1] On August 12, 2020, the singer announced the release of her fifth studio album, Leo-Nine alongside a new single "Homura", which was slated to serve as the opening theme song of the anime movie Demon Slayer: Kimetsu no Yaiba the Movie: Mugen Train (2020).

It follows her previous studio album Little Devil Parade released in May 2017, and marks her first full-length record in three years and five months.

featuring Lisa's long-time collaborator Pablo (Pay Money to My Pain), was pre-released on September 4.

[22] In July 2020, "Gurenge" was certified Million by the Recording Industry Association of Japan (RIAJ) for 1,000,000 full-track digital music downloads.

[25] It served as the first ending theme song of the anime series Sword Art Online: Alicization – War of Underworld.

[27][28] "Aijō" (愛錠) was served as a promotional single from the album on August 17, 2020, receiving a lyric video.

By doing so, she became the first female artist in 16 years and 6 months to simultaneously debut a song and an album in Japan since Hikaru Utada.

[32] It reached number one on Billboard Japan's Daily Album Chart, pulling 41,451 copies in its first three days.

With "Homura" simultaneously topping the Japan Hot 100, Lisa became the first act in history to have both a song and an album debut at number one on the chart.