- Name: Fairy Tail: The Color Residing In The Heart （ＦＡＩＲＹ ＴＡＩＬ 心に宿るｃｏｌｏｒ）
- Author: Miu Kawasaki （川崎美羽）
I'm trying to get more information about the book, but except for the name and the author... I got nothing else. If there's more info, I will update it as soon as possible.
Source: Here