If you fly Japan Airlines (JAL), you will arrive at Terminal 2E at Charles de Gaulle Airport (CDG), the gateway to Paris. Getting a SIM there is incredibly easy.
When you enter the baggage claim area, you will find a SIM counter like the one in the photo below.
This is what you should get there: Orange Holiday Europe.

For 39€, it includes 10GB of data, 120 minutes of calls, and 1000 SMS messages, which is more than enough. Ask the staff to insert the SIM into your phone1 It will then be ready to use for 2 weeks. If you need to use it longer, you will have to register information such as your passport details. Registration requires your passport number, phone number, and the SIM number printed on the SIM card holder, so be careful not to throw it away.
Your phone number will soon be sent to you by SMS, but it is also printed as the MSISDN on the back of the paper included in the package.
It should normally support tethering as well, which would make it ideal, but for some reason I have not been able to get it to work. When I turn tethering ON, I lose the internet connection entirely. Strange. I went into an Orange store to ask about it, but it was packed because they apparently were having some trouble, so I gave up without asking. I therefore do not know what was actually happening….
Footnotes
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