The Fourth Neck (Shi no kubi), she is a delusional pop idol whose poor sales (68th place, though Reiko constantly mocks her with "69th") partly led to her becoming one of the Orochi. Her behavior is nearly manic as she persistently tries to impress the other Orochi with her showmanship, but beneath her energetic exterior lies a dark past.
Corona's flashback scene suggests that she had to have sex with someone to get her first big break in show business. It is likely that this event involved considerable violence and left Corona emotionally scarred.
(Source: Wikipedia)
