Yumeria is based on a popular DC/PS2/PC game.
Mikuri Tomokazu has a dream of a girl fighting an enemy in devastated earth, a panorama filled with fear and hatred. With his help, the girl is able to fight off the enemy.
When he awakes, the girl, Mone, is next to him. A battle in the real and dream world has just begun...
The story revolves around a young man, Mikuri Tomokazu, who has vivid dreams of strange enemy aliens coming to attack him in a bizarre dream world with floating land formations. A young girl who speaks only one word - Mone - with superpowers appears in the dream to save him for the present peril, and later materializes with him in real life. Over time, the girls in his family, his girlfriend, and a stranger girl named Neneko also become part of his dreams and all have their own unique super powers there. The dreams recur, and the enemy appears to gain strength, requiring ever more effort from the embattled young women to repel them. Eventually Mikuri comes to realize that the dreams may foretell the possibility of the enemy aliens coming to destroy the Earth in real life if he and the girls cannot defeat them in the dream world.