
Quick answer — Yoko Ishida performed 3 anime themes, including "I'm Sorry EXODUS" from SHIROBAKO, "Otome no Policy" from Sailor Moon S, "Shiawase no Iro" from Oh! My Goddess: Flights of Fancy.
Yoko Ishida performed the anime theme songs "I'm Sorry EXODUS" (SHIROBAKO), "Otome no Policy" (Sailor Moon S), "Shiawase no Iro" (Oh! My Goddess: Flights of Fancy).
Yoko Ishida's first listed anime theme is "I'm Sorry EXODUS", the opening of SHIROBAKO.