In a future teetering on the brink of collapse, a mysterious darkness begins consuming everything, threatening both past and present. Amid the chaos, a lone researcher documents their desperate survival through audio logs, revealing a facility overrun by medieval soldiers and a secret portal bridging time itself. As supplies dwindle and hope fades, the researcher encounters fellow survivors and navigates a perilous journey through the facility’s lower levels.

When the Assonian Republic intervenes with troops and negotiators, humanity’s last chance hinges on forming an unprecedented alliance across centuries. With top leaders like Lord Thiurate, General Arcan, and Toulious entering the fray, the stakes grow ever higher. Lives hang in the balance, crucial research may be lost forever, and the fate of human civilization—and its connection to the past—rests on whether diplomacy and courage can prevail against the encroaching darkness.