This is the story of a monster who forgot his own name.
You could understand it this way: Once upon a time, there was a monster who thought he was the protagonist. Then he woke up one day and discovered that the author had forgotten about him.
In Year 23 of the Earth Calendar, a widespread viral infection struck Earth. Among the 500 million survivors, some gained superpowers after recovering.
In Year 43 of the Earth Calendar, an empire of superpowered beings rose to prominence. The empire hoped to use this as a means of ensuring humanity's continued evolution. It developed the planet Juno as a resource world.
In Year 123 of the Earth Calendar, the empire, which had lasted a mere 80 years, was overthrown from within.
The author plans to add another entry to their history of embarrassing writing. The entire setting of this novel is made up; I didn't look anything up or think it through (including the characters' names), so there are bound to be mistakes and inconsistencies.