If you're looking for manga similar to Blue Dragon ST, you might like these titles.
Al is the son of a Bernian blacksmith. After turning 15, he left his home with his father's sword to go on an adventure in this continent bound for war.
The cadets of Akademeia's Class Zero are legends, with strength and magic unrivaled, and crimson capes symbolizing the great Vermilion Bird of the Dominion. But will their elite training be enough to keep them alive when a war breaks out and the Class Zero cadets find themselves at the front and center of a bloody political battlefield?!
Nina, a wyndian princess, and her guardian Cray are searching everywhere for Nina's missing elder sister, Elina. While traveling to her last known whereabouts they suffer an accident. On her way to a nearby town, Nina meets Ryu, a seemingly amnesiac young man. This meeting triggers a series of events that will involve them with the godly race known as The Endless, immortal dragons with the power to shape the world itself.
The beautiful and prosperous ancient land of Terresia is being destroyed by the Devourer, a demonic creature from another planet. The World Tree, which created and protected this magical land, is wasting away from the Devourer’s continuous attacks. The World Tree uses what’s left of its strength to call on the world’s last hope in a dark battle of survival – you.