"Those fireworks are a slice of the universe."
The fireworks factory, Tatewaki Fireworks, located in a lush forest, is facing eviction due to the redevelopment of the town.
Tatewaki Keitarou has been holed up there for four years, immersed in making fireworks to complete the "Shuhari" fireworks, known as the phantom fireworks, in place of his father who disappeared.
Meanwhile, his childhood friend Kaoru, who lives in Tokyo,
has left her hometown after an incident in the past, but as the eviction date approaches, she visits the Tatewaki family.
The two meet again and devise a surprising plan to uncover the secret of the lost fireworks.
The key to this is the beautiful blue pigment "flower verdigris."