Skeleton’s Training Manual

When Lu Wu opened his eyes, he found that the world had changed completely.
The world before him did not have fancy magic, nor ultimate Dou Qi.
What it had were summoners that form contracts with summoned beasts.
And coincidentally, he was such a summoner, although not a professional one, and his first summoned beast was a piece of crap.
But that was fine, because he also had a golden finger!