The uncle of a researcher who is making a drug to promote estrus in order to breed endangered animals. Sumire, a niece who came to Tokyo for the university entrance exam. Sumire, an aspiring pharmacy student, is visiting her uncle's laboratory when she accidentally bathes herself in a chemical solution under development. It was a potion that made African elephants and mountain gorillas go into heat! "Uncle, it's hot! - "I have to mate right now!" - My niece who tripped in heat asks for a like a ferocious beast!