The girl continues the lesson with a sword appearing above her. "For example, if you find a sword... When you acquire an item, it immediately turns into a card." She explains, "In short, you have to convert 100 items into cards, and store them in the book." Gon asks, "Uh... We only need to collect 100 cards?" Stick figures demonstrate the process: an item transforms into a card when taken. The girl smiles and says, "But, if for some reason you need to use it, you can use the spell, 'Gain.'" Gon responds, "I see." She warns, "Once the card is inserted into the book, it can no longer be used as a weapon." A diagram shows the card reverting to a weapon when Gain is used. The girl concludes, "A card that is transformed back with the use of 'Gain'... Can't be transformed into a card again. This is an important point."