This Kimetsu no Yaiba (Demon Slayer): Kisatsu Kenbunroku fanbook contains information regarding the characters, such as birthdays, hobbies, among other personal details. Being that most Demon Slayer fans became so in 2019 upon release of the anime adaptation, the fanbook, which is one of the most sought-after pieces of merchandise for fans, is impossible to read since it would contain many spoilers from the manga. Fanbooks contain more information than manga, and some of these details take years to appear in a manga chapter, and years more to appear in the anime. Kimetsu no Yaiba (Demon Slayer): Kisatsu Kenbunroku ( 鬼滅の刃公式: 鬼殺隊見聞録) is the first fanbook of the Kimetsu no Yaiba (Demon Slayer) franchise. The surprise appearance of another boy named Giyu, who seems to know what’s going on, might provide some answers—but only if Tanjiro can stop Giyu from killing his sister first!

reading, music, movies, video games, writing a little XD, English, Internet, chocolate, all kinds of sweets,. Although there isn’t yet an official word on whether the fanbook will be translated or a tentative date of release, the 16th volume of the manga is set to be released in November, 2020.

I don't know if there's the fanbook in English but I didn't find it (I only found it in Spanish and Portuguese, which is what I have) but as it's not very easy to find information about it, I'll post some translated things from mine here.

Delve into the world of Demon Slayer: Kimetsu no Yaiba like never before with this official fanbook from Shueisha!

Jujutsu Kaisen Official Fanbook ( Jujutsu Kaisen Kōshiki Fanbukku) is the second Databook of the series, covering both the prequel series, Jujutsu Kaisen 0, and the sequel series, or the main series, up to chapter 133. With over 6 million of the world’s best eBooks to choose from, Kobo offers you a whole world of reading. Also please credit me+this post if you will be retranslating this to other languages and will be posting this to other sites. In addition, it also includes the original sketch of the first chapter of the manga and many pages printed in color.