One Light

 is a single by Kalafina.

Limited/Regular Edition CD

 * 1) One Light
 * 2) Mahiru (真昼)
 * 3) Samidare ga Sugita Koro ni (五月雨が過ぎた頃に)
 * 4) One Light ~instrumental~

Anime Edition CD

 * 1) One Light
 * 2) Mahiru (真昼)
 * 3) Samidare ga Sugita Koro ni (五月雨が過ぎた頃に)
 * 4) One Light ~TV size~

Limited Editions Blu-ray/DVD

 * 1) One Light (Music Video)

Anime Edition DVD

 * 1) TV Anime "Arslan Senki" Non-credit Ending Video