When the Sun went out

The world has dimmed to a perpetual twilight as the ancient Sun wanes, its once‑vibrant heat fading into cold darkness. Only a few hundred thousand people remain, converging in the last surviving city to watch the star’s final throes and to decide how humanity will survive the coming night. As the planet’s surface freezes under the weak, flickering light, the survivors must confront a future without the solar energy that once powered their civilization.

Among them is Kuila Rei, an astronomer who has spent a lifetime monitoring the Sun from the isolated summit of Mount 83. When the authorities order the remaining scientists underground, Kuila joins a band of engineers determined to repurpose the crumbling relics of past technology into a new lifeline. Together they begin to carve a massive shaft toward the planet’s core, hoping the hidden heat will become mankind’s last refuge.