The Sinner's End: Traveling to Another World and Obtaining the Strongest Assistance

When he woke up, he found himself in a cell. He thought it was a prank by someone who was at odds with him, but then he took a look at his hands and suddenly discovered that the little finger of his right hand was intact. It turned out that he had traveled through time... Super qualified? System? Goldfinger? There is nothing... The only thing I can use is a very childish-looking mechanical doll. How can I escape from this prison alive?