No one has ever seen a unicorn because he is cold and lonely. He hid himself deep in the black forest, where there was a mirror-like lake. Every day, he looked in the mirror and admired himself. Until one day, the happy Angel got so playful and discovered the beautiful unicorn. He also discovered his loneliness. Maybe it was due to angel's nature or some other reasons. In short, Angel decided to make him happy. However, giving happiness is a sacrifice no matter who it is, because happiness is a ridiculous sacrifice...