Episode 53 - Father's mortal enemy, Ryuukotsusei
Inuyasha sneaks off on his own to see Toto-sai. He asks Toto-sai if there is anything he can do to make Tetsusaiga lighter and easier to wield like it was before Goshinki broke it. If the sword is like it once was Inuyasha will not have to worry about it becoming a hinderance in battle and thus making him discard it and unleashing his full-demon blood. Toto-sai tells him of the dragon Ryukossei who his father once fought, but could not kill. If Inuyasha can kill the entrapped demon the blade should become lighter because Inuyasha will have done something his father could not, and the weight of his fang that is inside the blade will loose it's heavy weight. Naraku sees this using Kanna's mirror and then sends one of his puppets to the site where Ryukossei is imprisoned before Inuyasha arrives. As soon as he does, the fake Naraku melts the seal keeping Ryukossei asleep and tells him that Inuyasha is the son of the demon that sealed him. Inuyasha only expected to deal with killing a sleeping demon, but now the dragon is awake and thirsty for revenge. He manages to knock Tetsusaiga away from Inuyasha, who begins to transform just as the others arrive.
