逆行计划：共生者

In 1995, the "Project Retrograde", humanity's last hope, collapsed—the underground world, once seen as the ark of the apocalypse, was left in ruins due to the sudden invasion of an ancient parasitic lifeform known as "L.U.C.A."
Apocalyptic Gloom Returns, Humanity in Peril
You miraculously resisted L.U.C.A's parasitic invasion and even gained its power. One night, you understood its whispers...it had been guiding you towards the buried truth.
Secrets hidden from the world await beneath the tower. The once-safe haven is now a breeding ground for disaster.
What caused the underground mutation? What purpose does the parasite within you hold? As the cycle of civilization faces another collapse, you are the only key that can change fate.

Unlock Parasitic Skills, Become Kung Fu Master or Baba Yaga
Parasitized by the mysterious lifeform, you not only survived but also gained the ability to absorb other hosts' combat memories, converting them into unique parasitic skills and mastering diverse combat powers.
Encounter a kung fu master and Baba Yaga during your adventure. Absorb the master's memories to comprehend fluid close-combat techniques, balancing offense and defense. Inherit Baba Yaga's will to harness the precise and deadly art of gunfighting.
Freely combine skills according to your needs and preferences for an adrenaline-pumping battle. But be warned, overindulgence may lead you to become a puppet of the parasite. The choice to hold onto your humanity or fight to the end is yours.

Explore Mysterious Underground, Redefine Post-Apocalyptic Survival
Explore the post-apocalyptic world filled with retro technology, navigating through the remnants of past civilizations. Scavenge for survival resources and find hope amidst the ashes.
Use the LUX energy system to manipulate the underground weather, influencing monster behavior. Climb towers to unlock paths to unknown areas, eliminate mutated creatures, and uncover the deeply buried truth of this world.