Venus Wars

Venus Wars takes place in the 21st century, where two worlds have been colonized: one is Earth, and the other is Venus, which was terraformed after an ice asteroid collision. The population on Venus is descended from four generations of Earth colonists, but has also inherited humanity's negative traits. The fragile peace between Venus' two main nations, Aphrodia and Ishtar, is shattered when Ishtar launches a surprise attack on Aphrodia, prompting Hiro Seno, a skilled motorcycle rider, to join the Aphrodian army and fight for his country's survival.