Rowan Pendragon Transmigrated in to an unknown novel with ambiguous technology. the world perished to mana and beasts. The only chance for a poor man like him to live well is to become beast tamer.
However, look at this ... he became a master of a shepperd system.
At this point, it is natural to pump your fist in to the air declaring you will save the world !
World can take care of it self just fine.
He will only care for his dinner, his little sister and the next animal he is going to raise !