I Unified Europe in the Middle Ages

Hans, a loser from the history department, was dragged into the Middle Ages by a strange USB flash drive and became an apprentice to a Dutch blacksmith. A Viking attack took away his family and fiancée. After revenge, he was captured, but due to his wisdom and bravery, he became the sworn brother of the Viking King Harald III. The king was assassinated, and he traveled around Europe. With the help of modern knowledge and the mysterious power of the USB flash drive, he successively dealt with real figures such as King Richard the Lionheart, King Philip II of France, Emperor Frederick I, etc. In the humor and danger, he saw that the royal families of various countries were addicted to summoning the ancient gods of the starry sky. He participated in the Crusades and met Laila, the daughter of Saladin, who held the second "key" in Jerusalem. The two fell in love while fighting against the Doomsday Ritual. Hans was promoted as the leader of Europe.