Li'l Bird Li'l Bird Colorful Colors

Li'l Bird Li'l Bird Colorful Colors is a book mentioned in the Black★Rock Shooter anime. The book is stated to be about "a bird that takes people to "a world of different colors".

Description
In Mato's world, it was clearly popular enough to merit having more than one edition printed, also suggesting that it may be a very old book.

Mato is extremely fond of this book, to the point where she reads it over and over again and has a phone charm of the eponymous Li'l Bird. Yomi Takanashi also seems to be interested; she has a copy of the first edition, and drew a picture based off of a picture in it to serve as her phone wallpaper. She later sends this picture to Mato.