
Quick answer — Hitomi Terakado worked on Mermaid Melody: Pichi Pichi Pitch Pure (Theme Song Performance), Mermaid Melody: Pichi Pichi Pitch (Theme Song Performance).
Hitomi Terakado worked on Mermaid Melody: Pichi Pichi Pitch Pure (Theme Song Performance), Mermaid Melody: Pichi Pichi Pitch (Theme Song Performance).