Well, it depends on the context of the light novel. It could have cheats related to leveling up quickly in a game - like scenario within the novel. For example, finding a hidden item that multiplies experience points. Or perhaps cheats for getting rare items or unlocking secret areas. Without reading the novel, it's hard to say exactly what the cheats are.
The reign of the king appeared in the first episode of the anime, Little Fox Demon Matchmaker.
While waiting for the TV series, you can also click on the link below to read the original work of " Little Fox Demon Matchmaker " to understand the plot in advance!
In my opinion, 'Reign on Me' isn't a true story. It likely combines imaginative elements to craft an engaging narrative rather than being a direct account of real-life events. Maybe there are some common themes or emotions that can be related to real life, but not the entire story.