Love Position Halley Densetsu (1985)

Lamina is from an alien race that called Elorians and they want the destruction of mankind, She came to Earth guided by Haley comet in 1910 so she will destroy the world but she loved the beauty of Earth and couldn't do it. Lamina lives in the jungles of Vietnam were she meet and fell in love with a soldier during the war but after an accident they got separated and they meet again after years when a second Elorian messenger comes to find the traitor and bring the destruction in Earth.