Isekai Cheat Magician

After driving off the army of the King's younger brother, King Gilmar rewards Taichi and the others are with weapons from the royal treasury. Taichi, Rin, and Muller head down to the training grounds to test out their new weapons. However, Taichi grows ill along the way and goes downton by himself to buy some medicine. There he encounters Cassim, set on revenge, who forces him to accept a duel...