Re - Robert B. Marks - Bog

The Aftermath Begins
The war between the creations is over. The survivors, now known as "Arrivals," must pick up the pieces and create a future for themselves.
In the story worlds, isekai protagonist Daiki Yamato makes his long way home to his beloved Athena. But Daiki's author is dead, and it is up to him to figure out how to give his story a happy ending.
In America, Alice Matson and her creation, monster hunter Jenny Calhoun, make a desperate call for help to mech pilot Atria Silversword Kaguyama and JPRG mage Princess Stellaria, setting off an encounter that will change the course of all of their lives.
And in Japan, Lt. Colonel Atria Silversword falls out of her story into the real world to discover that her author is the legend Atria Silversword Kaguyama, the creation who became her own creator.