Earth was facing an unprecedented energy crisis. If there was any hope of solving it, that would be underground… Apart from that, no one knew what lay beneath the surface. The year 20XX. Humanity finally fell into complete resource depletion, and Earth itself began to decline gradually. Amidst unsuccessful space development and underwater development for energy, humanity suddenly turned its attention to subterranean energy. I too joined the land survey project in search of new energy. Then, deep within a cave in an untouched forest, I successfully captured the life form we had been seeking.
