E's is a Japanese shōnen manga series written and drawn by Satoru Yuiga. It was originally serialized in Monthly GFantasy from 1997 through 2005, and later published in 16 tankōbon volumes by Square Enix from March 18, 2003, to February 27, 2010. The series focuses on Kai Kudō, an "Esper", who is recruited by an organization called Ashurum to become a soldier to purportedly save other psychics from regular humans. After a mission in Gald goes wrong, Kai finds himself living with a man named Yuuki and his adopted sister Asuka. As he learns more about Ashurum, Kai finds himself wondering what their true goals are, and worrying about his ill sister, who is under Ashurum's care.