The song takes place in an unspecified place and time. A mysterious singer learns in pairs the words "Father" and "Mother," "Wind" and "Water," "Friend" and "Dream," and finally learns love. At this point she understands the shape of the world, but is unable to describe her current feelings and so will keep playing with words. Next, the singer learns in pairs the words "Lie" and "Pain," "Crime" and "Punishment," and finally learns "Evil." At this point she understands the darkness of the world, but is unable to describe how she feels as she's cast aside. She will keep playing with words, despite never wanting to know them in the first place. Finally, the singer says that she will continue to be at the side of the person to which the song is dedicated, as she teaches them new words.
Kagamine Rin'sVOCALOID2 voicebank is utilized. The song utilizes synth keyboard, bass guitar, drums, pipe organs, cymbals, chiptune, and synth chords.
The song starts with the verse. The song repeats four times, the sequence of two verses (0.00 and 1.46), prechorus (0.52 and 2.19) and a chorus (1.04 and 2.32). After the instrumental at 3.05, a refrain of the prechorus and chorus follows (3.21). A variation of lu, li, la follows (3.55) that. After the silence, the first line of the song's melody is repeated as the Coda with other lyrics (4.14). The chorus and the lu, li, la is a variation of Ode to Joy by Beethoven start at 3.58. An arranged version was released in an album.