Yume Oukoku to Nemureru 100 Nin no Ouji-sama

The heroine is an ordinary, everyday woman until the day she finds herself in another world and discovers that she’s actually a long-lost princess. Now, she must enlist the aid of the world of dreams’ princes and defend against the onslaught of nightmarish monsters known only as the dream-eaters.

(Source: Sentai Filmworks)