Otaru, a financial reference library, is a renovation of the old Otaru branch store of the Bank of Japan. The old structure of the bank is completely maintained in the store. The upper right is the bank's service window at that time, while the lower right is the bank's Treasury door. This is a good place to satisfy our curiosity for those of us who have no chance to visit the bank at all. What makes people feel more profitable is the Japanese's ability to collect and sort out the data and explain the profound financial and monetary knowledge in depth and shallowly. Walking along the learning guide board of the financial reference library is tantamount to a lively lesson on the popularization of financial and monetary knowledge. I even learned how to distinguish between real and fake Japanese coins, and how much it weighs to carry 100 million yen by hand.