Midnight and Zi Wen were two characters in the movie. There was a complicated relationship between Zi Ye and Zi Wen. In the seventh episode, Ziye and Zi Wen discussed the results of the preliminary selection. Ziye said that there was only one spot left, and Wu Que and Zi Wen did not perform. In order to let Wu Que get this spot, Zi Wen gave up her chance to sing. In the eighth episode, Ziye and Zi Wen were walking by the beach and saw the scene of fireworks, but found that it was Wu Que who helped. Gu Shengtian appeared at the company meeting and questioned Gu Xicheng's mentor candidate list. Gu Shengtian told Ziye that he would be the captain of one of the groups and hoped that he could recruit Chengge into his band. However, Midnight had pulled Wu Que into his group. According to the information provided, the relationship between Ziye and Ziwen seemed to have some complications and changes.
Definitely not. The Black Butler series has a set of established themes such as the supernatural elements, the Victorian - era setting, and the complex character relationships. The idea of a 'leashed slave story' is completely foreign to the official canon and is likely a disturbing creation outside of the proper series. It would go against the overall tone and moral framework of the official work.
There is indeed a 'Black Butler' visual novel. It features the same dark and alluring art style as the anime and manga. The visual novel might include different storylines, some of which could be exclusive to this format, providing a new perspective on the 'Black Butler' world. It often has a strong focus on character development and the complex relationships within the story, which is great for fans who want to explore more about the characters.