Synopsis

Earth was ending. He tried to save it with science. She betrayed him. Together they almost started World War III.
Now their home is facing an invasion of monsters and extraterrestrial forces, but it's no longer their problem.
They're dead and soon to be reborn as monsters. Instead of saving their world, their job will be to destroy another one.
But there is something wrong with his mind, and she'll have to work hard to keep him from getting himself killed.
Oh, and the universe seems to function like a litrpg.

Current schedule:
5 chapters a week, one every Monday, Tuesday, Wednesday, Thursday, and Friday

Content Warning: One lead in the story is suicidal at the start and undergoing a pretty bad breakdown, while the other is possibly even more messed up, only better at hiding it. Their need for therapy is a plot point, and, given the nature and length of the story, they mess up a lot before they get better. Also, there are a lot of tropes which are usually done poorly which have been deliberately added in for the author's amusement, most having much more logical reasons to exist than normal.