Koisekai

 (コイセカイ Love World) is the 26th single of ClariS. It through SACRA MUSIC.

The title song will be featured as the opening theme for the TV animation Saint Cecilia and Pastor Lawrence, which will start broadcasting on July 12, 2023. The song will be available for download and streaming on online music services starting July 12. A short version of its music video premiered on July 13.

The coupling song "Blue Canvas" will be featured as the theme song for the Chinese version of the game application Blue Archive which will begin its service on August 3.

CD

 * 1) Koisekai (コイセカイ Love World)
 * Lyrics, Music & Arrangement: Asami Takeo
 * 1) Blue Canvas
 * Lyrics, Music & Arrangement: Maruyama Mayuko
 * 1) Kimi ga Iru to (君がいると When You Are)
 * Lyrics, Music & Arrangement: Maruyama Mayuko
 * 1) Connect (コネクト) - From THE FIRST TAKE
 * Lyrics & Music: Watanabe Sho
 * Arrangement: Yuasa Atsushi
 * 1) Koisekai -Instrumental-

BD (First Press Limited Edition)

 * 1) "Koisekai" Music Video
 * 2) "Koisekai" Dance Video
 * 3) ClariS HALL CONCERT 2022 〜Twinkle Summer Dreams〜 at LINE CUBE SHIBUYA Selection
 * 4) Twinkle Twinkle
 * 5) Alethea
 * 6) Masquerade
 * 7) Cynical Suspense
 * 8) ALIVE
 * 9) Connect
 * 10) PRECIOUS

DVD (Anime Limited Edition)

 * 1) TV Animation Saint Cecilia and Pastor Lawrence Non-credit Opening Movie