It's very difficult to find a legal way to read it online for free. Publishers and authors rely on sales to make a living, so they don't usually offer their books for free on the open web. However, as I said before, libraries might be an option.
Another option could be to look for audiobook versions on platforms like Audible. Sometimes they offer free trials which might include access to 'Kingdom of Ash'. But remember, always make sure you are using legal means to access books to support the authors and the publishing industry.
Try looking on dedicated light novel websites. Some popular ones might have 'How a Realist Hero Rebuilt the Kingdom' for online reading. Just make sure the site is legal and safe to use.
It could be seen that there were many websites that provided free reading of 'The Crown Prince of the Kingdom'. This novel was a story about the Crown Prince of the Great Qin Dynasty. The main character wanted to control the world and enjoy the company of beauties. He planned to kill the treacherous officials, destroy the enemy countries, and conquer the East Ocean Continent, using Great Qin's might to rule over the four seas. There was no conspiracy in the novel, only the plot where the protagonist killed everything. However, the specific plot and plot development needed to be read in full.
You could start by looking on dedicated manga sites. Sometimes, even search engines can lead you to places where you can read it online. Just make sure the source is legal and reliable to avoid any issues.
Well, I really like 'The Magic of the 10 Kingdoms' fanfiction. It delves deep into the magical aspects that are often overlooked in the original concept. The way it describes how magic works in each of the 10 kingdoms is fascinating. Then there's 'The Rebellion in the 10 Kingdoms'. This one shows the political unrest and power struggles within the kingdoms. It's a great read if you're interested in the political side of the 10 kingdoms. Also, 'The Friendship in the 10 Kingdoms' is a heartwarming story about how different characters from various kingdoms form strong friendships.
One great 'Tears of the Kingdom Fanfiction' is 'The Adventure Beyond Hyrule'. It takes the characters on a journey outside the known boundaries of Hyrule. The author does an amazing job of keeping the personalities of the game characters intact while introducing new and exciting challenges.
It's possible that the main characters in 'kingdom online novel' include a group of rebels. They might be fighting against an unjust ruler in the kingdom. They could have different skills and backgrounds, like a skilled archer, a strategic mastermind, and a charismatic leader. Their struggle for a better kingdom can form the core of the story.