Mitsuboshi Colors

Chapter 54
Chapter 53
Chapter 55
Chapter 53
Chapter 55

From MangaHelpers: The "Colors" are three cute little girls who hang out together and say they're protecting the peace of their city. They have lots of fun together, doing stuff like playing games, solving puzzles, and going to the zoo. This manga follows their largely happy daily life. [tethysdust] 

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