[TalnSG]

The last I noticed there weren't many banking terms in the Japanese for Busy People text.

Since this does imply that you will need to understand both Japanese IT and Banking terminology, it sounds like this is way beyond your current ability. Given the highly sensitive nature and emotional volatility of that combination (I was in IT for a mortgage banker for a few years), some very subtle nuances could become firestorms quickly.

You better be very clear with the interviewer and pray they are willing to consider someone with a willingness to learn and only an example of beginning efforts.