Earth Defender Valkyrie Kagura ~Their body used as a seedbed for breeding~ v1.0 by yaminabedaiichikantai - Adult Sex Game

The earth were invaded by an unknown extraterrestrial being now known as "Alter".
Nobody knows what their purpose is, but one thing for sure, they are the enemy of humanity.
A special force called the "Valkyries" were formed to counter them and reclaim back the lands once owned by the humanity.
Will humanity prevail? or will they extinct in the hands of the Alters?​