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In the year 2157, Earth exists as a nightmare landscape, forever scarred by the catastrophic Sunflare Scorch of 2057. This devastating solar event unleashed three waves of destruction that obliterated civilization: first, electromagnetic pulses that fried all technology; second, intense radiation that triggered horrific mutations; and third, the complete collapse of the ozone layer, which rendered the surface nearly uninhabitable. The planet's temperature rose dramatically, weather patterns turned violent and unpredictable, and ecosystems collapsed across the globe.

From this crucible of devastation emerged monstrous threats that now dominate the Earth's surface. The Crawlers—horrifically mutated humans transformed by the Crawler Plague—stalk the ruins of once-great cities. What makes them particularly terrifying is their retention of human intelligence during the early stages of transformation; they represent an ever-present danger to anyone who dares venture above ground.

These monsters combine traits from multiple creatures in twisted configurations. They range from human-sized to massive Leviathan-class entities and can work together with frightening intelligence to systematically destroy any vessel or settlement they encounter.

Humanity's survivors cling to existence in underground vaults scattered across the planet. The most advanced is Cryo Vault Terminus—a massive subterranean complex built into bedrock with multiple levels of interconnected sectors. These facilities represent humanity's last bastion against the hostile world above, with advanced life-support systems, geothermal power, and cryopreservation technology.

In this desperate landscape, where 90.4% of humanity has been lost and the surface world has transformed into an alien ecosystem, one boy awakens alone in Cryo Vault Terminus. He has been granted access to the Phoenix Core—an advanced, quantum-based AI system created by pre-collapse scientists as humanity's last hope. He represents the culmination of Project Phoenix—a desperate plan to preserve human genetic diversity and ensure the species' survival. With the power of the Phoenix Core at his command, he alone holds the potential to revive the cryopreserved remnants of humanity and begin the monumental task of rebuilding civilization in a world that wants nothing more than to finish what the Sunflare started.
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A/N:

Inspired by FalloutxDemonSlayer

This isn’t a smut-fest or a porn novel, it’s ecchi anime–inspired, relationship-driven survival. The MC starts weak and gets hammered by the world, his growth is earned through trials, mistakes, and hard choices. The story uses a dating-sim style affinity system: relationships must be built and earned before any R-18 scenes unlock. In short: bonds and survival come first; the ecchi moments are consequences of trust, not cheap fanservice.

Additional Tags:
RomCom(Romance/Comedy) | Horror | SliceofLife | KingdomBuilding | Survival | No Yuri | No Netori | No NTR | No Rape | Gore | R18 | Yandare | Tsundere

The words of the mission plan still hung in the air as the team dispersed. Sera remained at the command table, her shoulders rigid, her gaze locked on the holographic map as if she could will the red blips representing the Crawler swarm to disappear. The others moved to their tasks, but Jin lingered, his eyes on the silver-haired girl who carried the weight of their survival.


He walked over, his footsteps silent on the polished floor. He didn't say anything at first, just stood beside her, looking at the same complex web of tactical data.


"You're carrying the weight of this whole thing," he said, his voice low and steady. "Let someone else carry it for a while."


Sera didn't look at him. "I'm the leader. It's my job."


"You're also our friend," Jin countered gently. "And friends don't let friends face down an army of nightmares alone." He placed a hand on her shoulder, feeling the tension coiled there. "Go rest, Sera. That's an order."


Chapter 133 - chapter unedited