Kouzuki Shin

Lumen, a city on the farthest reaches at the edge of the feared magical borderland. Roy is an new F-ranked adventurer that wandered to Lumen on his own whim. Life on this monster-infested outpost should be a harsh burden for a newbie like him... however, Roy's actually top-class in both swordsmanship and magic?! The sudden appearance of this out-classed "novice" causes havoc in the world, starting in this remote city! Source: Alpha Manga

A boy named Allen who was called not to be able to get the gift of God's bounty. But his true identity was a former hero with memories and powers of previous life?! Fortunately to have been expelled from his duke's family, Allen was trying to start a free-spirited journey, but he would encounter an assassination attempt on his former fiancée…?! Unwanted heroic saga opens for former hero who wants to relax in this world! web novel

Soma, the world's strongest swordsman, is killed in a battle with the toughest opponent imaginable: The Dragon God. On the verge of death, his only wish, to be able to use magic, is granted by the God... But with a catch. He has to be transmigrated to another world, where he must take the form of a six-year-old kid with apparently no skills at all! Thus, the man who was once called the Sword God, the strongest swordsman in history, must secretly harbour all of his former strength while trying to attain the only skill he cares about... Magic.