On an April night in Tokyo, introverted university student Kakeru Mano meets Koharu Fuyutsuki, a vibrant and warm young woman who immediately stands out from the crowd. Kakeru soon discovers a truth he didn't expect: Koharu is blind. Yet, unlike him, she refuses to give up on life, attending university, making friends, and harboring a seemingly impossible dream of one day launching fireworks. Intrigued by her resilience, Kakeru begins to realize that seeing the sparks might not matter at all—and inspired by the girl always by his side, he finally finds the courage to start moving forward.