
Quick answer — Mayako Nigo worked on The Idolm@ster: 765 Pro to Iu Monogatari (Theme Song Performance), The Idolm@ster: Shiny Festa (Theme Song Performance).
Mayako Nigo worked on The Idolm@ster: 765 Pro to Iu Monogatari (Theme Song Performance), The Idolm@ster: Shiny Festa (Theme Song Performance).