The War in Space

Wakusei daisenso is a movie starring Kensaku Morita, Yûko Asano, and Ryô Ikebe. Earth is attacked by alien spacecraft from Venus. But a Japanese scientist has constructed a space craft, the Gohten, with which he may save humanity.
The year is 1988, and in the midst of recovering from a near-miss with a large comet, Earth finds that there are much worse matters at hand: the sudden arrival of a strange army of aliens and their fleet of unstoppable warships.