(y/n) gets reincarnated into the fate universe with three wishes 1. a special sword 2. to be the twin brother of Mordred 3. to have high stats

After your death back on earth, god decides to give you another chance in a different world where all of your wishes will come true.

Sirens. Enemies from another world. But what if not every siren was bad? What if some sirens didn't agree with the others? That's what this story is about. A siren fighting against his own, to save a world that isn't even his.