Sesshomaru: Hidden in the Mist

I used to feel confused and lost, and I was afraid, because my time has never flowed in the same river as yours. But later I thought, if I'm destined to be only a fleeting visitor in your long life, then I might as well spend my brief life by your side. Lord Sesshomaru, if my life is destined to be that of a moth, then let me burn in your radiance... Premise: