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Character:

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. 

Source from Wikipeida