Kei Niitoki has a habit of meddling in other people's affairs; once she spots an issue, she feels compelled to resolve it. This trait led her to become the president of Shinyou Academy's ethics committee. Many believe this role suits her well, and some even refer to her as a big sister despite her petite frame. However, Kei finds her tendency to get involved quite troublesome. It stems more from a compulsion rather than any noble aspirations.
Additionally, Kei harbors a crush on Keiji Takeda, who is Touka Miyashita's boyfriend. This, combined with the fact that Kei knows Touka's true identity, results in a strained relationship between the two.
