Fumoto Kisugaki is a 16-year-old girl who works at a pet shop left by her mother. One day, while trying to get a snake for a customer, she accidentally slipped and hit her head on the ground and died. When she woke up, she found herself in the body of a baby snake, surrounded by a dense forest. With her veterinary knowledge and instincts as an animal caretaker, Futomo learns to survive and protect herself in this cruel world.