I remember the plot pretty well so hopefully somebody knows the name. The main character is transported to another world, but I believe the goddess already has a hero so she transports him to the edge of the world away from human contact cause he's ugly(?) along the way he fights a dragon which he forms a contract with and due to his power it becomes a human female, and he also fights a huge spider that goes through the same procedure as the dragon. Thanks.

It's Moon-led Journey Across Another World

Thank you