Hadar was abandoned on a mountain as a sacrifice soon after his birth. However, he was saved by a legendary old dragon and raised by him until the age of 12. Hadar, who had always possessed strong magical powers, was trained by the dragon, and without even realizing it, became the "most powerful creature" who could wield the most powerful spells. One day, to help him adapt to human society, Hadar is told by the dragon that he must attend a school for humans. Coming down from the mountain, Hadar makes full use of his magical powers and becomes a peerless wonder at school! (Source; Lanove, translated)

An anthology comic of Fate/Grand Order by various mangaka.

Fourth part of the Mantama series.

Yorozu Genkurou, wandering warrior, possesses an huge sword which makes him redoubtable to his enemies. While he crosses a dark forest, he suddenly sees the fall of what looks very much like a spaceship. Since, he is constantly being attacked by strange ninjas and ambitous fighters. Indeed, he will soon realize that his assailants are nothing else than aliens landed on Earth to find 3 artifacts made of Orichalcum, an alien substance with powerful mystical virtues. And one of the artifacts is the sword he wears. The hunt begins. (Source: manga-news.com)

An anthology comic of Persona 3 by various mangaka.

Kasugazaka Koukou Manga Kenkyuubu was originally published as a web novel on Shousetsuka ni Narou site from January 27, 2011 to October 8, 2014. The series was officially published by Kadokawa under Beans Bunko imprint.