The Clumsy Otaku Trio Goes to Another World

One day during a high school field trip.
The three otaku suddenly found themselves transported to another world.
No money, no connections, no cheats, completely broke.
This is the strange journey of three unfortunate otaku.

"World Setting"
Civilization Level: Equivalent to medieval Europe. Stone cities, unpaved roads, horse-drawn carriages are the main means of transportation.
Definition of Magic: "Advanced specialized skill" that requires theory and training. It is not something that ordinary people can cast without incantations or activate just by thinking.

"Geography/Environment"
Major Cities: A royal capital surrounded by castle walls, and port towns that are key trading hubs.
Provinces: Scattered with farming villages and post towns. Outside the roads connecting cities, deep forests and steep mountains spread out.
Ecosystem: In addition to livestock such as horses and cows, there are some "monsters (pests)". However, monsters are treated like unintelligent, ferocious wild animals.

"Society/Economy"
Currency: Gold coins, silver coins, copper coins. The prices are far from modern Japanese price levels, and physical labor is necessary to earn money for lodging and food.
Social Hierarchy: Clear distinctions between royalty/nobility, commoners, and slaves (or lower class).

"Guilds/Organizations"
Adventurer's Guild: Exists, but its reality is a "brokerage for day laborers". Main requests include ditch cleaning, cargo hauling, and pest extermination. The glamorous "heroes" are only a handful of skilled individuals.
Knights/Guards: City public order maintenance organizations. Authoritative and "guardians of the law".

"Relationship Between the Three"
The three members at the bottom of the school caste (Fatty, Skinny, Shorty) are ignored by everyone at school. Within this group, they are equals (or rather, they have a relationship where they moderately diss each other).