Originally from South Korea, Moon moved to Japan when she was 14. She has a bit of a harsh personality, being rather cold and callous to most people, as she's a bit of a misanthrope. She can't stand most human beings, due to the fact that she finds them incredibly annoying. She has a bit of a problem with alcohol and cigarettes, but is trying to get better for Aneko's sake, because they're childhood friends and Aneko is worried about her. She's rude, calculating and analytical. She enjoys mathematics and science. Moon's favourite colours are neons. She joins the group reluctantly, mostly to just find out about her past life, which she didn’t even initially believe in until indubitable evidence was thrown in her face. She’s quite grumpy most of the time, coming off as rather standoffish and brusque. She has an older brother that used to be rather rude to her in the past.