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Kotomi's Father's suitcase as seen in Clannad Visual Novel
Album Clannad Original Soundtrack
Artist Magome Togoshi
Released 13 August 2004
Length 2:44
Label Key Sounds Label
Music by Magome Togoshi
Arrangement by Magome Togoshi

TOE was is the fourth track of the second disc of the Clannad Original Soundtrack album. It was released on 13 August 2004. It was based off Étude Pour les Petites Supercordes.

TOE is an acronym for the theory of everything, a theoretical physics theory which was the subject of Kotomi's and her parents' research. It was used as a background music for the final scene in the Drama Club room of the episode of the same name and Clannad Visual Novel.