Mecha Rainbow

Kiiroisora Kelly is a bright and cheery 15 year old who has recently been enrolled into Niji Iro Academy for Girls. And during her first day she makes her two best friends: Shirono Tenshi and Yamaguchi Mackenzie, before the trio are suddenly transported into the mystical world of Iro mecha where they must fight not only a crazy team of villains, but also their millions+ foot solders called Colorless and another team of Mechas.

And along the way they shall meet some new friends: Lulu, Olive and Kaze in addition to a trio of college students.