Traveling from modern times to the wizarding world around the Renaissance, because of being stuck with magical animals, his foot slipped and he and his package fell into the river, and he fell into the future where he eats melons every day.
Note: The protagonist has only watched Harry Potter and Conan, and has heard of Gojo Satoru's chicken-and-cat fight, but has no understanding of the world of Fumino.
Motto: Hitting the ball straight is a good habit