
The Earth was facing an unprecedented energy problem. If there was a possibility of a solution, it lay underground… Surprisingly, no one knew what the underground was like. 20XX. Humanity finally fell into complete resource depletion, and the Earth itself gradually declined. Amidst energy development efforts such as space and underwater development failing to yield significant results, humanity suddenly turned its attention to underground energy. I also joined a land price survey project in search of new energy. And, I succeeded in capturing the life form I was looking for deep within a cave in a certain primeval forest.

















There are tons of fantasy works out there, but a work with this kind of worldview is quite rare. As someone who enjoys AV as 100% fiction, I found it quite good to be fully immersed in fantasy. I'd like to see patterns where she's experimented on by researchers as part of an ecological study, or gets intimately involved with humans. The split tongue is divisive, but it's a role only this actress could pull off. Great casting! Applause to the production team! It was a fresh and interesting attempt.
The setting was unique and interesting. And it was definitely erotic. The scenes without dialogue, with the underground female moaning and the male devouring, really showed a raw, instinctive act. However, most of the content was sex with the underground male, so I would've liked to see more underground female x human sex. Also, the underground x underground scenes had color adjustments that, personally, felt overexposed and hard to see. They didn't need to do that.