Hearts of Iron 4 Player's Guide to Save the Isekai World

Erich Kasper was supposed to be dead, but the Kingdom of Cascadia thought otherwise in instituting the dawn of a new Heroic Age, an age of salvation, not from the calamity brought upon age-old demons nor the collapse of civilization by nightmares born from the imbalance between the two concepts of good and evil. The Land of Verussea is enduring, but a new catastrophe awaits them.

Themselves.