But when four of the prototype devices are stolen, a wave of madness breaks out among the research crew and slowly spreads into the Japanese population. Dr. Chiba joins a thoroughly rational policeman, Detective Konakawa, to track down the mysterious malefactor who is holding the sanity of Japan in his hands; they are joined in their quest by the title character, a pixielike redhead (drawn in a more traditional, wide-eyed anime style than the rest of the cast) who acts as a dream guide and trip doctor for those undergoing DC therapy.
Source: wiktionary