She previously sang the OP songs for the first and fourth Prisma Illya TV anime, and the two new songs are written/composed by herself.
The after story of the TV anime fourth season 3rei! is scheduled to be screened in 20 theaters in Japan from August 26, 2017.
Lantis has posted a three-minute preview video for anison singer ChouCho’s latest two songs “kaleidoscope” and “Usubeni no Tsuki” (The Light Red Moon), which are featured as the theme songs for the upcoming feature film Fate/kaleid liner Prisma Illya: Sekka no Chikai (The Oath under the Snow) to be released in Japan on August 26.