Quick answer — Blush performed 1 anime theme, including "Kono Sora no Mukou" from Glitter Force Doki Doki.
Blush performed the anime theme songs "Kono Sora no Mukou" (Glitter Force Doki Doki).
Blush's first listed anime theme is "Kono Sora no Mukou", the ending of Glitter Force Doki Doki.