Monster Girl Encyclopedia Stories: Diary of the Age of Monster Love

Monster Girl Encyclopedia Stories: Diary of the Age of Monster Love (魔物娘図鑑物語: 魔の色時代のダイアリー) is a four part novella containing brief descriptions of encounters with a Slime, a Holstaur, an Anubis, and a Succubus.

Synopsis
...

Canonicity
This book is a story by another author which Kenkou has given personal approval to by providing endorsement, artwork, and publication under the Monster Girl Encyclopedia name. This work is not a part of the primary universe canon but takes place in an alternate universe that adheres to the same rules.