City Hunter - Season 2 Episode 26 : Targeted Witness: A Dangerous Beauty dressed up like a man (Part 2) 1991

After a Shooting Range accident, Ryo finds out that Keiichi and Keiko are in fact the same person. But Ryo decides to hide this fact from Kaori. When Ryo makes advances towards Keiko while she is in his male costume, Kaori is furious thinking that Ryo would rather be attracted to a man rather than her. Kaori is then kidnapped by the man attempting to kill Keiko and Ryo and Keiko must rescue her.