Mitsuboshi Colors

Mitsuboshi Colors (三ツ星カラーズ) is a Japanese manga series written and illustrated by Katsuwo. It has been serialized in ASCII Media Works' Monthly Comic Dengeki Daioh magazine since 2014. An anime television series adaptation produced by Silver Link premiered in January 2018.

Plot
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.