This song series is in the Namco Original genre, and is named after the person who provides vocals for all the songs, Mika Sato (佐藤美香). Mika's voice has a distant, almost mechanical quality that is very distinct. You'll instantly know if a song in Namco Original is sung by her. She explores unusual themes for her songs. She started off her vocalist career in Taiko fairly early, and comes out with one song every two to three versions or so. It's not one of the most highly anticipated series in Taiko, but it's very recognizable when there is a new song. It is unknown whether this is the same Mika Sato who is a Japanese pianist (is looking into that now), but it looks to be highly unlikely.
Masubuchi Yuuji (増渕裕二) composes every song here for her to sing.