Forged in Fire, Pretty in Pink

You're an average C-rank adventurer. So, when a teleportation trap sends you into the deepest layer of one of the deadliest dungeons in the world, your immediate assumption is that you're dead. The giant monster doesn't help with that assumption. But also in that chamber is a legendary sword, the Forsaken Blade. The Forsaken Blade is powerful and almost offensively pink. It also has a magical combat assistant, who happens to be a total airhead who hasn't had a friend for hundreds of years. Good luck. Fun is mandatory.