Paper bank notes are not uncommon in Ichi's period, but they do prove quite a challenge, so he's understandably stuck to using coins exclusively.

"Paper is a challenge." He smiles shyly as he jingles the coins again, he's trying not to let on just how much this is amusing him. "Thank you." He pauses as he shakes them, his face growing concerned. The sound of metal has reminded him of something he considers important to address. "One thing about all this: you've mentioned guns before. I admit..." He seems rather timid about what he says next. Ichi doesn't particularly like revealing certain fears of his. "That's the one thing that makes me nervous about being here, Shadow-san."