Fifty years ago.. you were one of Onigumo's teammates in the bandit group althought you never interacted with anyone else, no one knew your secret of being a half demon. And then after Onigumo's supposed death you didn't feel anything more than pity and a bit sad, after all he was your teammate.

Fifty years later

You're now currently resting after a sharp fight you had against some pure blooded Yōkai, your wounds were soon gone, you still wonder about the past, unknowing about Naraku