Keiko Tanaka (田中 恵子 Tanaka Keiko) is Kaoru Tanamachi's friend who has a crush on a boy in her class that she confesses to him while Junichi Tachibana and Kaoru later give her advice on various things.
Keiko has shoulder-length dark brown hair that has bangs hanging over her eyebrows and brown eyes.
Keiko is the quiet and shy type who is always smiling.
- The name Keiko means "celebrate" (慶), "respect" (敬), "open, begin" (啓) or "favor, benefit" (恵) (kei) and "child" (子) (ko).
- Keiko's surname Tanaka means "field, rice paddy" (田) (ta) and "middle" (中) (naka).
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