The Good Old Days of Steel, Guns, Stars, and Sea

In the future, humanity develops the ability to interfere with history through advances in technology. Whenever signs of an apocalyptic crisis appear, warnings are sent back to the past, allowing humanity to move onto a different timeline in time and avert the crisis. But the more often this is done, the greater the interference with past events. As these variables build up, the Dragon Maiden Ailin's interference with the “present” ultimately causes humanity to receive no timely warning when the zombie apocalypse breaks out. Humanity's repeated disruptions of the timeline also lead to the interstellar Zerg discovering human civilization ahead of time, forcing humanity into an early war with them. There is one female lead, but there are also battle maidens (inspired by Steel Garand, Girls' Frontline, and Azur Lane, though they differ from the original settings). The battle maidens here are more like artificial intelligences, and are primarily equipped with Chinese weapons.

2026-07-23, author's note: I have an important work-related certification exam in August, and I'm basically studying with a candle burning at both ends. There won't be any updates for a while.