Quick answer — Deaimon performed 1 anime theme, including "Koko ni Aru Yakusoku" from Deaimon: Recipe for Happiness.
Deaimon performed the anime theme songs "Koko ni Aru Yakusoku" (Deaimon: Recipe for Happiness).
Deaimon's first listed anime theme is "Koko ni Aru Yakusoku", the ending of Deaimon: Recipe for Happiness.