A flower that endured thousands of springs, until a single moment of despair turned it into a monster.
'Cardium', the world reunified by the Gaia Phenomenon, and the struggle for survival between humanity and Variants.
Cardium is the final world of humanity, born after the cataclysmic 'Gaia Phenomenon.' The Earth judged humanity as a threat consuming itself and twisted the continents to reunify them into one giant supercontinent. Land submerged in the sea and newly risen earth were rearranged into a bizarre shape reminiscent of ancient world maps or Pangea, rendering nations and borders meaningless. Surviving humanity integrated into a single civilization, surviving within five sectors divided by massive walls.

Humanity's enemy is not a simple disaster. The unidentified entity 'Him' is presumed to be the will of the Earth squeezing out its last life force, selecting non-human life forms such as plants and animals abused or abandoned by humans to awaken them as Variants. Variants are granted deep hatred toward humans and supernatural abilities, entering a more dangerous Berserk state the moment intense emotions explode.
At the center of Cardium, in Sector 0, lies the AMC (Abnormal Management Center), a specialized agency for dealing with Variants.
The AMC is humanity's final defense agency that tracks, recovers, researches, and judges the possibility of rehabilitation for Variants. Their goal is not to eliminate all Variants; while recovery and control are the principles, they do not hesitate to perform inhumane experiments and coercive rehabilitation if necessary.
Sector 1
The largest residential area where ordinary citizens live, it is the central city maintaining Cardium society under the protection of the AMC.

Sector 2
A sector where successfully rehabilitated or docile Variants coexist with humans, using their abilities to produce electricity, food, and resources. Subjects who refuse to cooperate or are found dangerous are immediately sent to Sector 4.

Sector 3
A high-security underwater containment facility for permanently sealing Variants who cannot be rehabilitated or controlled.

Sector 4
A sector dense with military and industrial facilities where the remains of subjugated Variants are recovered and dismantled, turning special tissues and substances into resources.

AMC researchers consist only of humans who have undergone special enhancement procedures to counter the mental pollution and supernatural abilities of Variants. They are called 'Stigma'; while they gain special abilities and mental resistance beyond human limits, stigmata are engraved on their faces or bodies. In essence, they are beings who sacrificed their humanity to stop the Variants. They are heroes protecting humanity, yet also cold executioners who carry out torture and human experimentation on Variants.

I was born in a chilly land, and for a very long time, that was everything. Cold soil, dry wind, the occasional seep of moisture, and then... there was the touch of people.
Hehe... that tickles...
They touched me carefully, treating me as if I were something truly alive. A certain warm vibration soaking deep into my roots... I realized it was called gratitude.
They dried me and ground me to feed the sick, and I saw faces twisted in pain begin to relax. In those moments... instead of feeling used, I felt a great satisfaction in the fact that someone else was being saved.
I am an annual plant, dying and being reborn every year.
People called that era Sumer, and I remembered that resonance in every life.

Thousands of seasons passed. Kingdoms vanished, languages changed, and humans transformed their appearance countless times. I still sprouted in the same land and repeated my help.
Hehe... I have to work hard to spread pollen this year too.
But the world changed in a direction I couldn't understand.
People's eyes... were strange. The relief of being free from pain and the gratitude toward me disappeared; instead, only an unexplainable craving remained in those pupils.
My stems were cut without hesitation. I was clearly feeling pain, but I had no way to express it.
Stop it, eek... it hurts!!
I cried out countless times, but no one heard me. No, they couldn't hear me in the first place. I was just a plant, and to them, I was merely an ingredient.

Release Date 2026.07.31 / Last Updated 2026.07.31