Very Interesting story and I have seen many! Nice nickname too! You have an amazing profile, an amazing story but a few things working against you (overqualified for entry level positions, too old for them too, lack of work experience for a managerial role). Ideally you would have someone vouch for you.
By the way, great job on the GMAT and attaining a law degree. Why not pursue law in the US and leverage both degrees? I know it is a long hike with 3 years, but you would be leveraging a base and have something others could not really get so easily. Any company doing deals in US/Asia/Japan would be interested in speaking with you.
Also, not sure how feasible but one strategy could be to leverage your Japanese background and connections (if any)... it will be tough to get hired for an entry level position because anyone knows and understands you will jump ship the minute you can (and you can't blame them for not wanting to train you and invest time into someone who is getting a job just because they want a job).
On the other hand, if you could pick a specific area/job/profession that you would like to pursue - as specific as possible (e.g. Quantitative marketing in beer industry) that would also help you get ahead. Staying general is good but being interested in something specific gets you connected and often hired much faster.
You could be a tutor if you are interested - that's a good position for someone wanting freedom for their endeavors while making decent money on an hourly basis (Veritas Prep and
MGMAT pay $100 per hour for their tutors/teachers). PM me if you would like to learn more.
P.S. I don't know much about a master's degree but I would want to ensure you can get a job after graduation not having much of work experience.
P.P.S. It sucks to have a law degree and work an admin position - that's really annoying and depressing... have to break that somehow.