Inuyasha's life Is at Stake.

During A Dangerous Hunt, the gang has to settle down for the night it is the night of the new moon they cannot risk being out in the open so they try to take cover for the night, but the hunt they are on is dangerous enough they ended up coming across a monstrous witch who decided to put a lock on the Half-Demon Inuyasha's powers or when the sun rose, he could no longer take his original form back to his half-demon self, because she feared his power and his sword could definitely defeat her, and end her rain, so she put a curse on him when he was at his a weakest or a spell that locked his powers away to where he could not transform back into his true self.

so, when the gang was in a dangerous situation, he was now the one who was in trouble because he could no longer take his true form this put him in endanger with other demons as well, and he couldn't use his sword to protect himself so they have to find help from somebody who can break the spell-lock but who?