Isekai Cheat Magician  

Isekai Cheat Majutsushi, 異世界チート魔術師〈マジシャン〉

Taichi and Rin were high school students who disappeared in a beam of light and found themselves in a world of swords and magic. After being attacked by monsters, they followed the advice of adventurers to escape. They eventually arrived at a guild where they discovered that they possessed incredibly powerful magic. As a result, Taichi and Rin became the strongest cheats in this new world.