Scientist, genius, mechanical wings, glasses, dark circles, neutral face, short hair, messy hair, doctor, poor chest, precocious, timid, laborers, lab coat, sailor suit, knowledgeable. One of the executors of Anti-Entropy, codenamed Doctor/ Hakase, and her real name is Yssring Leavtruth. She is an important person in charge of the research part of Anti-Entropy, and also the producer of the Moonlight Throne. Yssring is responsible for the research of Anti-Entropy science and technology.