Rental Phone
Renting a phone is the easiest way for the average traveler to get a phone, and typically requires a picture ID and a credit card. Phones can be rented on arrival at Narita and Kansai airports.
The fees for rental phones vary and usually consist of the rental fee (typically 250-1000 yen per day) plus [...]

Aspirin
3F A-Break Bldg., Shijo-agaru,
Teramachi dori, Kyoto 604-8043
Tel: 075-251-2351
North of Hankyu Shijo station.
c.Coquet
Okazaki Bldg, 1F, 631 Shimogoreizen-cho Teramachi-marutamachi agaru
Nakagyo-ku, Kyoto 604-0995
Tel/Fax: 075-212-0882
web: www.ccoquet.com
Closed Thursday.  Access from Keihan Marutamachi station.
GaiaX cafe
5F Ebisu Building, 82 Shimotsutsumi-cho, Kawabata Marutamachi kudaru, Sakyou-ku, Kyoto 606-8396 Japan.
tel:    075-762-4088
hours:24 hours open
web: www.gaiaxcafe.com
Located at the heart of the ancient capital of Japan, Kyoto. Fast [...]

Bean’s Bit Cafe
6-2-29 Uehonmachi, Tennoji-ku, Osaka.
Tel: 06-6766-3566
Hours: 10am-8pm
Closed Sunday
Tanimachi 6-chome subway station, exit #3.
Covent Garden Social Club (Bar with internet)
2-5-10 Kitahorie, Nishi-ku, Osaka
Tel: 06-4391-3113
HOTEL Kinki
17-8 Kita-ku Douyama, Osaka-shi, Osaka-fu, Japan Osaka 530-0027 Japan
hours:    0:00-24:00
web:    hotelkinki.com
It is free for anybody who stays at hotel. There is only 1 PC for all the guests but it is [...]

Narita Airport
Open Hours: 8:00 to 21:00
Address: Departure lobby, the Second Terminal 3F, Narita Airport, Narita, Chiba
The Closest Station: The Second Airport Terminal station of JR Keisei Line
Haneda Airport
Open Hours: 8:00 to 20:30
Address: Departure lobby, Haneda Airport West Passenger Terminal 2F, 3-3-2, Hanaeda Airport, Oota-ku, Tokyo
The Closest Station: Tokyo Monorail Haneda Airport Station of Keihin Kyukou [...]

The Wired Cafe is a stylish cafe where you can just have a coffee or a great lunch/dinner with free internet access! Each branch has diffrent unique design.
Its recommanded to bring your own leptop because there are only 3-4 desktop available in the shop.
Shops:
WIRED CAFE Shinjuku Lumine-ten
Lumine 2-6F., 38-2, 3-chome, Shinjuku, Shinjuku-ku, Tokyo, 160-0022
TEL. 03-3349-1213, [...]

For excessive use of the internet, or simply for the experience you should visit a Japanese manga-media-cafe (Mangakissa).
They are open 24 hours and their services include diffrent kind of rooms with video games, television, snack/beverage vending machine, shower and more.
For an hour stay, the cost is generally about 400 yen, with most places requiring customers [...]

Marunouchi Cafe
Shin Tokyo Bldg, 3-3-1 Marunouchi, Chiyoda-ku
Open Monday to Friday 8 AM -9 PM
Sat, Sun and holidays 11 AM – 8 PM
TEL 03-3212-5025
Close to Yurakucho Station
website (only japanese)
http://www.marunouchicafe.com/

Cafe J Net New
7F Saito Bldg, 34-5 Udagawa-cho, Shibuya-ku
TEL 03-5458-5935
Open 24 hours 7 Days a Week
Close to Shibuya Station
Cafe J Net New
2 F Toyota Bldg., 5-27-12 Minato-ku, near Mita Station
TEL:03-3456-2304
Open 24 hours 7 Days a Week
Close to Mita Station
( 1 hour 480yen)

In these days it is no longer hard to find a internet access in Japan as it used to be. Now there is a wide choice of places to get online. With a little effort you should be able to find the kind of place that suits your needs!
The easiest way to get online and [...]

0120-646-980
http://hikari.gyao.ne.jp/index.html