Keiko Takamura (篁 蛍子 Takamura Keiko) is a friend of Ichika Tachibana.
Ichika Tachibana describes Keiko as "a proper young lady from a good family, gentle and kind." who is the type that is easily amused by simple things, such as shaking a duster in a sunbeam.
However, her parents appear to be rather controlling, which causes Keiko some distress with regards to a boy she liked.
- The name Keiko means "firefly" (蛍) (kei) and "" (子) (ko).
- Keiko's surname Takamura means "bamboo grove" (篁).