Advice for large withdrawal USD to JPY

Hi there! I'm seeking advice on a large-ish (between 3-3.5 million yen withdrawal. My visa is tabled right now so i'm not bothering with Japanese bank accounts rn. If it makes any difference I'm basically a house wife, I am not working in Japan. Anywho, I may be needing to at some point withdraw around 3.5 million yen, and I don't trust myself to just haul it around or even leave it in my apartment as I come from an American mindset and worry too much 😅 Any advice for this large withdrawal of yen? It's not practical to use my USD cards for this really.

Update; I was overthinking this entirely too much and I should expect to wire transfer & I'll stop worrying and just go about my normal daily business with my Schwab card and normal amounts of cash. The large purchase will be wired. I'm not sure why I got so in my head about this. Thank you all for being kind.

(And no thank you to the person who said this could only be for tax evasion purposes)

by niceaphextwins