Can I discount Japanese yen bills?

As paper money, it must be flexible, and because your wallet is folded, it can't be completely flat, so folding is inevitable.

As for the Japanese who believe that folding wealth will run away, there is no scientific evidence to prove it. As long as they don't have such superstitions and customs, there is no need to care too much. As for whether there will be disrespect for the Japanese, this does not exist, and paper money will inevitably bend in long-term circulation.