After waking up one morning team RWBY and team JNPR find themselves stuck with many alternate forms of themselves. Now, they have to find a way back to their world, and whose world they're in. With many new allies and enemies, they have to settle problems quick, or they might have to watch their worlds burn.

Basic idea; when Shirou Emiya walked through the cursed fire that marked the end of the fourth Holy Grail war, a small part of the ruined Holy Grail embedding itself into his body. Letting him see and understand what no mortal should. By turning his life into a RPG game?