Ex-Crown Prince favors the Villainess

"I request you to give up your position as the Crown Prince."
"..."
Arthur Zemira. After his mother's death, he gave up his position as crown prince to the son of the new empress to avoid civil war.
Now as the first prince of the Zemira Empire, he himself went to live in an abandoned building located in a corner of the royal palace.
Watch him grow, slowly making his way to capture the villainess.