If you're looking for manga similar to School City Valanoir, you might like these titles.
The wizard Agahnim abducts Princess Zelda and confines her in the dungeon of her own castle. She telepathically cries out for help and her pleas are answered by a boy named Link. The two escape the castle together, but Link's adventures are only just beginning. He must find the legendary Master Sword and save the land of Hyrule from Agahnim's tyranny!
Link receives a telepathic message in a dream one night from Princess Zelda, pleading for help. She's been abducted by a wizard and locked in the dungeon of Hyrule Castle. When Link awakes from his dream and finds that his uncle has also disappeared, he sets out to find out what is going on. Little does he know that rescuing the imprisoned princess is only the beginning of his quest!
A terrible tragedy befalls Link's family and friends when the traitorous Agahnim launches a plot to seize the Triforce and unleash a terrible evil on the world. To bring justice to Agahnim, Link needs the Master Sword and sets off on a quest to find it. Link's journey may also help him discover what happened to his parents, and while Agahnim's minions and traps are dangerous, this link to the past may be even more challenging!
Adol Christen, a young man from the mainland, sails to the besieged land of Esteria in search of adventure. Esteria is being overrun by beasts under the control of the evil priest Dark Fact, and the people of the land are running out of time. However, there is a prophecy that tells of a hero from another land who will come to save Esteria—and his name would be Adol Christen.
Jonathan and another young boy named Asuma both seek to become Samurai. A mysterious samurai saved them when they were young from the fallen angel Amy.
Begin the adventure of a lifetime in this classic fantasy series set in the world of the legendary Dragon Quest video games! Raised by monsters in a world scarred by battle, Dai has the heart of a hero! But it will take a grand world-spanning adventure and the help of some great friends for Dai to master the powers within him and become the hero he was always meant to be. Dai lives on Dermline Island, where he dreams of being a hero. One day, when a group of heroes visits the island, Dai finally gets a chance to prove himself! But these visitors are not what they seem, and soon Dai finds himself fighting to protect the Golden Metal Slime these so-called heroes have come to abduct.
The year is 200X. Jin, Akira and Lena are three child hood friends who like mysterious things. One day in the library, along with the mysterious transfer student Ami, they find the "Akuma Compendium". They chanted an incantation in the book and, to their surprise, devils appeared. Ami then told Jin and Akira that they are the Devil Children that will decide the fate of the world. She hands them their Devil Risers. The group then pass through the "Door of Time" to the land of Valhalla where they fight an evil ruler known as Imperius who plans on conquering all of the world. The Nakama of Jin is Rand, a Sol Lion, and Akira's is Gale, a Hylon.