Like several other works of the series, this first encyclopedia has a frame story where it is also a publication in its own setting, and the reader is addressed as though both they and the author can travel and interact with the various sexy species described.
It includes information on the monster girl world, interspersed with 100 monster girl profiles, to introduce the reader to some of the inhabitants of this lewd and lascivious universe.
Monster Girl Encyclopedia I (魔物娘図鑑 Ⅰ) is the original book of the Monster Girl Encyclopedia series by Kenkou Cross.
