Having lost the will to live, Mirai Kakehashi decides to kill himself on the day of his middle school graduation. However, Nasse the angel suddenly appears and saves his life. Furthermore, Nasse grants him Wings and Arrows to inspire hope in him. Mirai initially rejects Nasse's offer, but after acquiring the Wings, he slowly begins to regain his lost hope. However, Nasse reveals some shocking information to him... In order to verify the truth, Mirai confronts his aunt who is raising him.