A heroine who lived her every day one way or another is one day, suddenly lured into a different world. That world is the "Dream World" where dreams are people's life source. The heroine is the princess of this "Dream World".

The "Dream World" is currently being threatened by monsters that devour dreams called the "dream eaters" (yumekui). People deprived of their dreams, drifting in a sleep they can't wake up from. Many princes whose dreams were also stolen. A world heading towards destruction...

While becoming confused and sometimes almost disheartened, the heroine awakens the sleeping princes and recovers the dream world with them. Forgotten dreams, lost dreams, hidden dreams inside one's heart... They will certainly be of help to someone.

Source: yume100.wikia.com

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Sequel: Yume Oukoku to Nemureru 100 Nin no Ouji-sama