In the far future, humanity expands into space and thrives. Suddenly, an event known as Jikushin, a “time‑and‑space earthquake”, disrupts all networks and resets civilization. From this reset, humanity regains its footing and enters a new age of prosperity called the Second Age, led by the Transvaal Empire that dominates the galactic core. The pre‑reset science and technology, termed “Lost Technology,” are deemed divine and worshipped by priests called Tsuki no Miko. Meanwhile, a guard fleet is stationed at the galaxy’s frontier; although it appears to be a conventional army, its true nature remains enigmatic.