Last Man On Earth When There Is No Earth?, Volume 1

Discovering that he is the last man...
... he realized his life might not be so bad.
But what's the point if he's trapped on that godforsaken planet?
After a long bad day ending in the most unexpected way, a young man wakes up in an unknown location with most of his memories missing.
Saved from dying as a pickled corpse by a strange alien he's then told that "Humans are a unisex species." and that he looks nothing like them.
Apparently the human male population went extinct while he was asleep, leaving only females behind.
Not only that but it seems he's stranded on an uninhabited planet with an alien as his sole companion.
A new life. The burdens he has to shoulder couldn't outweigh his happiness at the chance to restart. But the more he learns about the universe around him the more he realizes.
It's not always rainbows and sunshine.