Ep 13. The Secret of the First Night! Black-Haired InuYasha

In the thirteenth episode of Inuyasha season 1, titled "The Secret of the First Night! Black-Haired InuYasha," the group sets out to investigate rumors of a demon attacking and killing women on the night of their weddings. As they follow the trail of the demon, Inuyasha suddenly senses something strange and disappears, leaving Kagome and the others to continue on without him.

As they make their way closer to the village where the demon is said to be attacking, Kagome and the others come across a strange group of women who appear to be waiting for the demon to appear. The women tell them that the demon only appears on the night of a woman's first marriage, and that it has been attacking and killing brides for generations.

As Kagome and the others continue on towards the village, they come across Inuyasha, now with black hair instead of his usual silver. It is revealed that this is his human form, and it seems that Inuyasha has lost all memory of his life as a half-demon and his travels with Kagome. Kagome is heartbroken and doesn't know what to do, but she is determined to help Inuyasha regain his memories and return to his true form.

As they continue their investigation, they come across a young woman who claims to have seen the demon up close. She tells them that the demon was actually a man, and that he had come to her on the night of her wedding and asked her to run away with him. She refused, and he attacked her in a fit of rage.

Kagome and the others eventually track down the man who is responsible for the attacks, and it is revealed that he is actually a former suitor of the women who were attacked. He had been rejected by each of them, and so he had turned to demon magic to exact his revenge.

With the help of Kagome and the others, Inuyasha is able to regain his memories and return to his true form. Together, they are able to defeat the demon and put an end to the attacks on the brides.

"The Secret of the First Night! Black-Haired InuYasha" is a thrilling episode that showcases the strength of Kagome and the power of the group as they work together to overcome obstacles and save the day. The episode also delves deeper into the complex history of Inuyasha and his past as a half-demon, setting the stage for even more exciting adventures to come.