The manga's author, Ai Yazawa, asked for Olivia when a staff member at Avex gave her a copy of Olivia's singles "Sea Me" and "Into the Stars". It is reported that she exclaimed, "It can only be her!" when she first heard the music. "A Little Pain" was Olivia's first release for this role in which she first made the general theme to the lyrics, then wrote the song in English. Later on, the lyrics were changed to Japanese. The single is about "Reira's loneliness, pain, and strength," as Olivia found that she could relate well to the character.