The leading choice for contraception in Japan is condoms, the second most popular (almost 20%) being pulling out, followed by the rythm method. The pill languishes in last place with an audience of just over 2% of the female population (vs. 18% in the US, 25% in the UK and 52% in Germany, for example).
- The Pill
There are strict rules on bringing the pill into the country. It must be prescribed to you, and you're only allowed two months' supply. My girlfriend tried to bring more than that and had her parcel got stopped at customs waiting for her permission to destroy the contents. They wouldn't even send it back to England.
You can get prescribed it here by an obstetrician and it costs about 3000yen per month, and you have to go back every three months for a check-up (not free).
I recently found a great article about the types of Pill available in Japan.
- Depo-provera is not permitted.
You can't bring it with you, and no-one will import it or inject you with it even with a prescription. However, there are similar shots available. Ask a gynecologist.
- Contraception patches
There are several types of estrogen-only patches available (on insurance).
Several types containing both progestogen and estrogen.
Japanese condoms are okay, but (it's not a joke) they will not always fit Western men comfortably. They may also come off more easily than what you're used to. There are several shops in the big cities that sell all sizes and shapes. Look for The Condom Store, Condomania or places like that.
- The morning-after pill
Is very expensive (10,000yen and up) and not covered by health insurance, though I have heard of it going for only 3,000yen in Okinawa. It's referred to as the "aafutaa piru" and you need to see a gynecologist to get one. International clinics will also prescribe it to you if necessary.