[The crisis explodes and the Oasis Federation is established]
Rumor has it that there is a scholar named Sibel who found a dead ancient parasite on an altar in the ruins of the forest, and discovered a rare "abyss virus" that not only accelerates the evolution of biological genes, but also has an extremely strong vitality.
Carter, the chairman of a famous company, lost his daughter and established the company Yukiyama in order to bring her back to life. Chairman Carter hires Shibel as an officer of Yukiyama and begins researching the "Abyss Virus."
Carter, in a hurry to revive his daughter, began conducting human experiments behind the scenes. Due to an experimental accident, a virus leaked out and infected workers and experimental organisms one after another. It further spread to urban areas, and the world descended into crisis.
Since that accident, the crisis has exploded and the human population has drastically decreased. The remaining humans establish the "Oasis" federation, build bases to respond to crises, and protect humanity's safety with high walls.

[Four major races, coalition counteraction]
Rich people who believe in science, technology, and knowledge arm themselves with science and technology, call themselves machines, and have absolute command over the base. The machine race is oppressing some of the new humans, good humans who pursue justice. Due to the lack of resources, the conflict between the two factions is intensifying.
The survival of the primitive half-beast tribe hidden deep in the forest is threatened, and in order to protect their faith in the harmony of nature, they come out to the public and fight against the crisis.
Evil evolved species are constantly attacking the base. In order to counter the evolved species, the "Oasis" Federation accepts some half-beast races and rare and good evolved species into the "Oasis" Federation base.

[Collect genes and resist the threat of evolution]
Using Yukiyama's wealth, Shibel converted the Abandoned Research and Development Center in the snowy mountains into a shelter and collected genetic samples to study advanced viruses.
The Oasis Federation dispatches the adventure girl Tsukuyomi and her group to investigate the shelter, but they are surrounded by enemies and attacked.
When Tsukuyomi is in danger, the commander unexpectedly fights off the attackers and is chosen by the girls to be the general commander of the shelter. He stays here and helps the girls collect genetic samples. Complete the required number of immune viruses researched by the "Oasis" Federation.
And from this moment on, the wheels of history turn, and the story of the commander and the girls continues...
A world crisis approaches and a new life begins, but are the commanders ready for an adventure with the girls?
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