Items

Items are a variety of all the relevant and named items appearing in the Hachinan tte, Sore wa Nai Deshou! series.

Magic Sword Hilt
A hilt that takes on the shape of a sword with the corresponding magic attribute that is poured into it.

Magic Bag
A bag that can hold an immense amount of items depending on the user's magic capacity. It is also stated that anything inside will not age or go bad with time.

Magic Core/Stone
Harvested from monsters.

Magic Gem/Crystal
Processed magic cores.

The Helmut Kingdom
The kingdom uses a variation of a precious-metal based coinage system. The coins repeat on a simple 10x valuation. The Helmut Kingdom does not appear to use any official denominations below the value of approximately 100¥.

Although Gold Plate and Platinum Coin/Plate currency exists, it is rarely used, except for high-end transfers between nobles and/or the King.
 * In the LN, it is explicitly pointed out that if you use anything above a gold coin in standard commerce, you are unlikely to be able to get change for it.

Bartering
In the frontier regions, as well as between adventurers, it is common for individuals to exchange goods directly via a barter system, directly trading one good for another, rather than using explicit coinage.
 * An example of this is when, in the LN, Wend repeatedly exchanges hunted game (mostly rabbits) with farmers in the Baumeister Knighthood in exchange for soybeans, so that he can experiment with creating miso (and soy sauce). In the anime, creating miso doesn't occur until much later, after he has entered the academy and inherited the estate of his former master.

Discrepancies
Both the Anime and the LN contain several errors when translating between Japanese yen (¥) and Helmut Kingdom currency, though the majority of the time both follow the table above.

At several points, the anime and LN diverge in the descriptions of currency used, as well as the amounts.
 * For example, the gift to the church for the "real baptism" was a few hundred (200-300) gold coins in the anime, but was exactly 10 platinum coins (equivalent to 1,000 gold coins) in the LN. The LN further notes how the platinum coins shined differently when being placed in the Cardinal's magic bag, along with gold coins he already possessed.