Sara was the reincarnation of Oin's sister! & that the Director of the show was actually the living souls of Oin's sister's lover!
Fate have brought them a happier encounter but ends with a sorrow ending.
Im quite amused & at the same time felt touched about this storyline
Not even a battle has been ensued but more like a side story from another character with Kitarou & Mana & Neko-musume just assisting them😣