Quick answer — Miku Sawai performed 1 anime theme, including "Gomen ne, Iiko ja Irarenai." from Kill la Kill.
Miku Sawai performed the anime theme songs "Gomen ne, Iiko ja Irarenai." (Kill la Kill).
Miku Sawai's first listed anime theme is "Gomen ne, Iiko ja Irarenai.", the ending of Kill la Kill.