Sonia is a first-year high school student at the same school as Kana. She is a skilled healer who has already qualified as a C-level healer through an overseas skipping class system. Arrogant and impatient, loves to be the lead in any field of activity. She wants to prove that age is not a hindrance to talent, for which she intends to surpass Ria Karasuma in the mastery of vocal healing.