A Demon's Journey - Chapter 566 William’s Adventure

Rob was a high-level hacker and wanted by many government organizations because he leaked the secrets of many countries. So he didn't dare to come out of his hiding much. Since he was alone, he lived a difficult life, which that he found the joy and the excitement of life in only two things: The rule of the Internet, and the anime world. One day he came across an interesting advertisement on his personal computer that turned his life upside down.[Ding!] [The art publishing system is being prepared...] [The system is ready!] From that time onwards his goal became to draw One Piece manga in the pirates' world!

On his usual way to home Mikado Tsuchio fell into a hole that suddenly opened on the ground. Just like that, Tsuchio falls in a different world, he lands on a Grappler Wyvern and manages to tame it.

Tsuchio decides just like that to live in the other world, the reason for his quick decision: he wants to make a monster girl harem.