|Class and Year||1-F|
|Physical and Vital Statistics|
|Manga||Volume 2 Chapter 7|
Because Ruri is a robot she doesn't show a lot of expressions on her face, but she always want to helps everyone from the dormitory. She has a reserved personality as Mimori Seiteikouji said.
Ruri was created by Mahougasawa electronics, she is an android imouto, newly developed to take the imouto position in a family.
She helps Souta Hatate with the flags and removing his death flag.
- The name Ruri means "lapis lazuli" (瑠璃).
- Ruri's surname Ninjabayashi means "ninja" (忍者) (ninja) and "forest" (林) (hayashi/bayashi).