I haven’t read the light novels but I think the first season ends at the end of the second volume as the penultimate chapter is “Balsam and Woodsorre”.
There are 12 English translated and 15 Japanese novels so based on the first season, season 2 may cover volumes 3 + 4 leaving 5-12?
I decided to try and go in a different direction
The day the world changed
Possible scenarios:
Story:
Follows the MC as they navigate this new world
Now that I have typed it out I realise there are a million already like this.