ツヴァイ・ウォルター
A japanese H-game with following story:

In 2005, a group of meteors deals a big blow to humanity. But thanks to advanced science and technology, mankind overcomes extinction by creating new intellectual living creatures called "Dissolve".

In 2007, incredibly powerfull outerspace creatures called Elcid launch their onslaught against earth. Extinction is only avoided because of the advances made in the recovery of the previous disaster. But in the end, in just two years
nine-tenth of the population loses their lives.

In 2017, last surviving members of the human race, "Dissolve" and an another new race intellectual living creatures called "Hybrid" all band up together for their final stand against Elcid....
zwei worter