Ambient Mage

My first work, will definitely have plot holes lol.
21st century guy gets transmigrated into a videogame series. He's not really smart, but he's not dumb as a rock either. He's a little bipolar when it comes to how he should act, flipping from being heroic to miserly back to heroic. The rest can be summed up so: kid becomes mage with the ability to blend in assassins creed style, but will use it for every purpose instead of just becoming a killer, goes to the academy.....