Quick answer — Ami Koshimizu performed 1 anime theme, including "Que Sera, Sera" from Ashita no Nadja.
Ami Koshimizu performed the anime theme songs "Que Sera, Sera" (Ashita no Nadja).
Ami Koshimizu's first listed anime theme is "Que Sera, Sera", the ending of Ashita no Nadja.