Fire Emblem: A clash between worlds

What happens when worlds collide, time collapses, and one person finds themself in the middle of all of it. Meet a whole band of new characters, as well as old, as someone from our world is faced with the words we all dread; permadeath. They must save the world, and stop from becoming a monster, what some call... A self insert! And where can you get a coke around here, anyways!