A strange world

Sword and magic, gods and dragons, demons and abyss, humans and races.
A door appears in this fantasy and weird world, bringing in a person who doesn't belong here.
When the consciousness of two civilizations collide, what will emerge from each other?
The Druid stood in front of a wheat field several meters high, while the fishmen chased the fish in the fishing ground;
Magic trains flashing with inscriptions rolled across the plains, and the sound of multiplication recited recited from the academy;
Ogryn and the children sat on the tentacles of the Dark Child, swinging and counting;
Dwarves and elves clink glasses, devils and priests shoulder to shoulder;
Gods chase and play in the streets, and nameless things chat happily around the wine table;
The life and death of the hero and heroine in the magical image moved the devil in the bottomless abyss.
Time will eventually tell whether this person brings happiness or destruction, but before that——
He wants to learn the lingua franca of this world and not let himself starve to death on the streets.