A Sea of Writings is the 20th episode of the Mushishi anime series. There lives a girl whose leg is paralized because of a mortally dangerous mushi which it contains. The girl is a descendant of a woman who agreed to contain this mushi to help overcome it by imprisoning it in a human body, but it was not defeated, it continues to live in the bodies of her descendants. That mushi was a horrible creature aiming to kill all living things, mushi, beasts, and humans alike; it appeared long time ago during a natural disaster, a vast drought, that endangered all. No record of its appearance or properties survived, noone knows what it was like and what it did, how and why did it want to kill everything and everyone.