
Quick answer — Sou performed 2 anime themes, including "Tada, Kimi no Mama de" from ZENSHU, "Q.E.D." from The Case Book of Arne.
Sou performed the anime theme songs "Tada, Kimi no Mama de" (ZENSHU), "Q.E.D." (The Case Book of Arne).
Sou's first listed anime theme is "Tada, Kimi no Mama de", the ending of ZENSHU.