This song is part of The Fantastic Garden series. The origins of the characters in the song were revealed in the Star Girl and The Illusion Paradise series. The story of the song is that two girls, Rho (Rin) and Lambda (Luka), consider the various possibilities and outcomes that come with changing the future as a question of infinite things. The one they seek is a "concurrent light (ray)" that goes through the past, future, and present. They believe an "ideal solution" will be met after escaping the closed circle of the forgotten world. Main article: The Fantastic Garden