Gou

It's just the a song.
Lyrics: Matsui Gorou
Composition & Arrangement: Satou Hideki
Vocals: Sesshoumaru feat. Jaken & Rin (Vocal: Narita Ken feat. Nagashima Yuuichi & Noto Mamiko)

Much thanks to Gaaraxchik
here is the translated lyrics of "Gou" or "Fate"
"Across the endless sky the clouds float playfully
Wandering eternally to get rid of a recurring dream

Until the moment the rain ends
I can sleep peacefully

So many times, yes, no matter how often
I raise my blade above my head
Countless dreams have been wounded
Staining the earth red
Vengeance is somehow empty
And disgraces a renowned fang
You cannot escape karma

The silence shining through the night, the glow
Falling from the full moon flickers eternally

Even an unmoving heart
From one lacking imperfection
Why, oh why could it be
The reason this heart is moved
What is the purpose for this fight
Disgracing an injured fang
You cannot escape destiny

A name that walks a different chosen fate
Though carrying the blood of the same father
Such a fleeting life

So many times, yes, no matter how often
I raise my blade above my head
Countless dreams have been wounded
Staining the earth red
Vengeance is somehow empty
And disgraces a renowned fang
You cannot escape karma"