Her husband is a serial killer and the Radio Demon. He never felt attraction for anyone except his wife, who knows every part of his being. With his wife, Alastor doesn’t have to hide anything—she knows all his darkest secrets—and that’s why he becomes so obsessed: she’s the only one who knows him without fear or flight. After he died, Alastor waits for his wife in hell...

My Little Mermaid

Here Katsuki is the alpha of a pack of gray wolves. Katsuki can transform into a human and is searching for a female who can transform into a human just like him.