
Quick answer — Airi Suzuki performed 2 anime themes, including "heart notes" from Kaguya-sama: Love is War -The First Kiss That Never Ends-, "Heart wa Oteage" from Kaguya-sama: Love is War -Ultra Romantic-.
Airi Suzuki performed the anime theme songs "heart notes" (Kaguya-sama: Love is War -The First Kiss That Never Ends-), "Heart wa Oteage" (Kaguya-sama: Love is War -Ultra Romantic-).
Airi Suzuki's first listed anime theme is "heart notes", the ending of Kaguya-sama: Love is War -The First Kiss That Never Ends-.