The term "kasumi-doa" seems to be a combination of two Japanese words:
1. Kasumi (霧) - means "mist" or "fog" in English.
2. Doa (洞爐) - can mean "cave" or "grotto" in English.
Together, it could be translated as "Kasumi's Cave," which might refer to a scene involving a person named Kasumi or a setting with a cave-like environment filled with mist or fog. This tag is typically used for adult content and could relate to various themes and scenarios in a porn video, such as specific locations, actors, or types of scenes.