Yui is a big fan and initially an assistant to Girls Dead Monster. She is known to be hyperactive and talks extremely fast. Hinata finds Yui annoying, which results in bouts between the two of them though in truth, they truly care about one another, saying that had they met before they died, they would have fallen in love with each other. She wears a devil tail and shackle bracelets on her wrists, giving her an image of an imp or devil. She also has wings hidden by her hair on her back. After Iwasawa's departure, Yui becomes the new rhythm guitarist and vocalist of Girls Dead Monster, as well as its leader. Yui plays a Gibson SG Special electric guitar. She later becomes a part of the main SSS, following them along on missions, though she does not contribute much.
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