Monster
Quick Definition
Hentai featuring sexual encounters between humans (usually female) and non-human, often grotesque or mythical creatures.
In-Depth Explanation
The monster genre covers a wide range of creatures, from orcs and goblins to demons and other beasts. These stories often fall under the "Fantasy" or "Horror" categories and can range from consensual relationships to brutal, non-consensual "Rape" scenarios. The "Tentacle" genre is a popular sub-category.