The Shadow Monster and His Groom summary: Dion gets married for the sake of his family and says his final goodbyes to his first love, the child of his dreams. However, after that, ominous things start to happen around him one after another like an epidemic, and eventually, someone saves him from taking his own life. *"I am your groom."* You can't see anything and you don't know his identity, but your relationship with him feels familiar and comfortable... What on earth are you..? (Source: Mr.Blue, translated)