Kyoukai Meikyuu to Ikai no MajutsushiBoundary Labyrinth and Magician of Alien World ; Boundary Labyrinth and the Foreign Magician ; 境界迷宮と異界の魔術師

When Theodore was dropped into a waterway by his half-brother, he suddenly recalled the memory of his past life. He had been a Japanese 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. - [Wikipedia](https://ja.wikipedia.org/wiki/%E5%A2%83%E7%95%8C%E8%BF%B7%E5%AE%AE%E3%81%A8%E7%95%B0%E7%95%8C%E3%81%AE%E9%AD%94%E8%A1%93%E5%B8%AB)