"Suicidal ideation"――. "I wish my existence would disappear from this world." A young boy living in the city, Yomiya Hashigo, while lying on his school's flower bed, and looking up at the blue sky, wishes. The sound of the cicadas piercing his ears, the hot sunlight scorching his body, with the hustle and bustle of the students in the distant. But he is only drawn to the blue, azure sky――to him, a peaceful moment. One year has passed since then, now a truant, Hashigo decides to run away from home. Wanting to find something that he has lost on that day, he arrives at a complex of abandoned buildings. Without anyone knowing, without being tied down, without thinking about the consequences or the future, he simply wants to live freely――However. Night sky seen from the rooftop, on a tall tower stretching out like a ladder to the moon, a girl is sitting there. "Angel"――She calls herself, with small wings on her back. But she only has one wing. "I need your help. My lost wing, let's look for it." Like making a wish upon a star, or pledging her love to the moon. The girl reaches out to the heaven as if praying. An angel who is supposed to save people, finds herself being saved by Hashigo. As a result, he is given a feather which grants him a special power. He would never have imagine, with someone he would not have met had he not run away, that he would now be looking for a wing. Like a story out of a fairy tale. The peculiar life of two people, at this evening, it begins. [Translated and edited from the official website]