The return of Ryo Saeba, the most lubricated detective of manga! Ten years ago, in the United States, City Hunter was forced to shoot at a duel one of his former partners, Kenny Field, which a criminal organization was blackmailing... Now, a mysterious murderer seems to have some after the famous cleaner! Something else seems to be worrying Umibozu, whose behavior is particularly suspicious in the eyes of his friends. At the same time, a pretty young woman named Sonia arrives at Cat's Eye, immediately attracting the attention of Ryo... But who is she?