|Japanese name:|| 桃井 恵子|
|Occupation:||Ekoda High School Student|
|First appearance:|| Magic Kaito Chapter 3|
Anime: Episode 219
|Appearances:|| Episodes: 1|
Magic Kaito Manga: 10
Magic Kaito 1412: 11
|Japanese voice:|| Yukiko Iwai (219)|
Ai Kayano (Magic Kaito Specials)
Atsumi Tanezaki (Magic Kaito 1412)
Keiko appears to be a close friend of Aoko Nakamori, possibly her best friend after Kaito Kuroba. It is not stated how long the girls have known each other. In the plot of Magic Kaito, Keiko often serves the same purpose that Sonoko Suzuki does to Ran Mouri: that of friend and foil to the female main character.
Although comparable to Sonoko, Keiko appears to have a far less abrasive personality. She is an avid Kaitou Kid fan, but knows better than to advertise this in front of Aoko.
 Plot overview
Although Keiko often appears in Magic Kaito, she never appears in the Detective Conan manga, while she appears only once in the anime, in the first part of episode 219 which is adapted from the Magic Kaito manga.
Keiko is also a recurring character in Yaiba, and in the last chapter of that manga a scene set after a three years timeskip has her telling Sayaka Mine that Kuroba and Nakamori are a couple now, while Keiko's friend confirms having seen them together.
 Relationships analysis
 Family & Friends
 Aoko Nakamori
Keiko and Aoko are good friends together.
 Name origin
Like other characters in Magic Kaito, Keiko's name contains a color. The "momo" in Keiko's family name means "peach".