The Dimension - a world which coexists from human's imagination, faith, and beliefs. Kinds of creatures live there - The Angels, The Demons, The Spirits, and The Zodiac are some of them. Those living beings on The Earth - The Humans - who have passed away would be reincarnated as The Spirits. The Zodiacs are the stars above the sky. The Angels and The Demon are the highest rank of all creatures of The Dimension. Each of the creatures has their own Valleys, and they are forbidden to go to other Valleys. Only The Angels, and The Kings of each of the creatures are given consent to transport to other Valleys. The Humans are supposed to be reincarnated as The Spirits until one day, one of The Spirits happened to appear in The Angels' Valley, claiming himself a crooked silhouette.
"Probably I have fallen in love with this mysterious man." A booklover Tsubasa has been secretly looking at the man who always sat across her table. He was always there whenever she was present. They never talked to each other, but she somehow found it interesting to covertly glimpse at him and gaze at him. She did wonder whether the man realized what she has been doing, but she did not set any ill intention towards him, so she did not really mind what the man would think of her. Until one day, the mysterious man parted his lips just to say, "You are beautiful."