In the "Folk Custom Taboo Library" of the Municipal Archives, a yellowed "Dragon Boat Festival Strange News" is locked. It records a mysterious case in the 34th year of the Republic of China: a village used "living rice dumplings" to worship the river god. The rice dumplings were wrapped with living people's nails, hair, and even... Half a tongue. Legend has it that people who eat this kind of rice dumplings will be entangled by the "Zongzi Spirit" and be dragged into the river at midnight to become new "Zongzi Fillings".
Ah Zong, a folklore student, accidentally discovered when sorting through files that the "sacrifice method" in this record was exactly the same as the black cloth rice dumplings her grandmother stuffed her before she died. What's even weirder is that blood began to ooze from behind her right ear, and the blood beads condensed into the word "Dragon Boat Festival" on her wrist.
When Ah Zong found half a human face in the rice dumplings, she realized that some taboos were not meant to be followed but to be "fed". And she is this year's "sacrifice".