Boundary Labyrinth and the Foreign Magician

Boundary Labyrinth and the Foreign Magician summary:

When Theodore was dropped into a waterway by his half-brother, he suddenly recalled the memory of his past life.
He had been a j.a.panese citizen known as Kirishima Kagehisa, placed inside VRMMO character he had made in Break Force Online.
‘Theodore’ is a Combat Mage that Kagehisa played within BFO, and he realized his skills were progressing well even in this other world.
Theodore, who had lightly brushed off his half-brother to make his own place in the world, had ventured off to the large labyrinth existing at the Boundary City, Termuilles, to find his own place in the world.
Note For Readers. Theodore is 10 years old at the start of the novel.