That time I waited for a 1000 years

There are stories of a man and a woman who have lived a 1000 years just traveling. People say even the demon lords are afraid of them and you know it’s them because they always look the same. They say that they are ghosts of a betrayed prince and his partner or the other way around, because of their aura that makes you feels like you should bow to them. A 18 years old guy with long black hair with red eyes and a woman that has white hair and red eyes. They both have on their backs a all black katana that has a red line going from the tip to the handle right through the middle and the other one is a katana that is red with a black line that is also going from the tip to the handle. Some people say the red line is so bright that it got that way because of all the blood they have spilled. While the other ones line is so dark they say it’s so that the souls its taken can’t be seen. This is just a, I will try to work on but won’t put to much effort in so don’t expect to much type of story, but at least one chapter a week If you don’t like stories with really op protagonist don’t read and I don’t plan on adding all of the second season.