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Yume Oukoku to Nemureru Hyakunin no Oujisama (夢王国と眠れる100人の王子様, "The Dream Kingdom and A Hundred Sleeping Princes") is a mobile game developed and published by GCrest.
The lands are plagued by dream-eating monsters known as yumekui (ユメクイ, "Dream Eater"); causing the princes of the many kingdoms to fall into deep sleep. You play the role of the Princess of Träumere and journey through the lands to awaken the princes in order to save the kingdoms.