Rimless ~Fuchinashi no Sekai~

Rimless ~Fuchinashi no Sekai~ (Rimless ～フチナシノセカイ～) is the first ending theme for the first season of Toaru Majutsu no Index. It was introduced in the first episode of the anime and was replaced by Chikaigoto ~Sukoshi Dake Mou Ichido~ in Episode 20.

Tracklist
It was composed and sung by Iku, who did the music as well along with Kazuya Takase who also did the arrangement.

The single release features the full version of the ending theme.
 * 1) "Rimless ~Fuchinashi no Sekai~" (Rimless～フチナシノセカイ～) – 4:01
 * 2) "Nagori no Tsuki" (名残の月) – 4:39
 * 3) "Rimless ~Fuchinashi no Sekai~" -instrumental- (Rimless～フチナシノセカイ～) – 4:01
 * 4) "Nagori no Tsuki" -instrumental- (名残の月) – 4:35

Characters
By appearance
 * Index
 * Himegami Aisa
 * Aogami Pierce
 * Tsuchimikado Motoharu
 * Misaka Mikoto
 * Aureolus Izzard
 * Misaka 10032
 * Shirai Kuroko
 * Stiyl Magnus
 * Kanzaki Kaori
 * Tsukuyomi Komoe
 * Accelerator
 * Heaven Canceler
 * Tsuchimikado Maika
 * Kamijou Touma

Lyrics
Rimless ~Fuchinashi no Sekai~