Will I need a converter/adapter for my Macbook Pro in Japan?

I'm currently set to study abroad in Japan, and I have a few questions about what converters/adapters I'll need. Regrettably, I need to admit I'm not very tech-savvy, making this issue a bit more complicated for me.

Electricity in Japan runs at 100 volts and 50 hertz, and most (if not all) outlets only accept 2-prong plugs, according to the predeparture information I was provided with.

I should note that I lost the "plug" attachment of my Macbook's charger, meaning I have to rely exclusively on the 3-prong extension cord to plug my Macbook in. Needless to say, I should definitely get an adatper to be able to plug the 3-prong charger into Japan's 2-prong outlets.

When it comes to voltage and frequency, though, I'm essentially clueless. What converters and/or adaptors will I need to use my Macbook Pro in Japan? Are there any converters/adapters available that can address both my 3-prong plug and volts/hertz issues in a single product, or will I have to buy a separate product for each of these needs?

Thanks in advance.