can you spoil me what happens in the story, this manga last update was in 2024😕
The LN (still ongoing) is so far ahead that I don't know where I should spoil you.
Right after this, MC experiments with how magic works in this world and how to apply it to the war against the demon.
This series is heavy on the world-building. Not easy to read, but very interesting.
After the fortress is completed, the demon attacks. No chance of defending, so the MC struggles to evacuate as many civilians as possible.