A young man, Moneo, hears about a city that only can be found in the summer. He goes there, looking for love and romance, but he is seduced and captured by a demon. The demon takes him to a haunted castle to torture him. When he escapes his prison, he realizes that time has somewhat stopped and become twisted inside the castle. Moneo can not communicate with the outside world and he fears that he is losing his mind. Moneo discovers a trapped demon goddess, Nerina, who is looking for a way to escape, too. Together, Moneo and Nerina struggle to be free and escape the castle's curses, ghosts, monsters, and tragic past. Nerina gives Moneo a cat, Galeazzo, and a dog, Nerezza, who are magical animal friends that will help him on his journey through the dangerous castle. They must hurry before it is too late and the curses trap them forever.