Quick answer — Ryo from Supercell performed 1 anime theme, including "takt op.Destiny - Opening | takt" from takt op.Destiny.
Ryo from Supercell performed the anime theme songs "takt op.Destiny - Opening | takt" (takt op.Destiny).
Ryo from Supercell's first listed anime theme is "takt op.Destiny - Opening | takt", the opening of takt op.Destiny.