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Hotaru, who lost his parents when he was young, grew up in the house of his uncle, who runs an inn, and over the years developed a relationship like a real parent and child. However, the day Hotaru turned 18, her uncle summoned her to a storehouse that had been forbidden to enter until now. "I've been waiting for this day for a long time. This day when I get you ..." My uncle who suddenly attacked wanted to train fireflies all the time. What's more, he was trying to fulfill his old desire by superimposing the image of her dead mother on the firefly.