Well over a thousand years ago, Kaguya was born in the royal house of the Moon and was treated with utmost care as a princess. However, due to boredom, and managed to get Eirin Yagokoro to create the Hourai Elixir out of self-interest and consumed it. This was illegal, and she was executed. She was immortal, so despite being executed many times, she could not permanently be killed, so she was exiled to Earth and forced to live among humans as punishment. She was found by a bamboo cutter