What type of dream are you having? A sweet dream? A nightmare? How about a lucid dream? For Luna, after a certain tragedy, she never dreams a normal dream. Her dream has been lucid. She knows she is dreaming and she control her dream. She can do what people can't in her dream. Experience everything and be anything. But, above all, she can meet him, Kain. A guy that she creates to accompany her in her dream. What if he is a real person and not her imaginative creation? And fate brings them to meet. And he also likes her, a lucid dreamer. Things can never be happy like this. But what if their meeting bring forth the tragedy back into the light?