The available information does not specify any hidden fees for bond trading with First Securities, but it is important to note that the platform does charge commission fees for bond transactions. For domestic bonds, the fee structure is based on the transaction value, with a commission of 1.045% for amounts under 1 million yen. For foreign bonds, additional fees such as currency conversion or local transaction taxes may apply. Traders should ensure they understand all costs before making bond trades and confirm any potential hidden fees with customer support.