Use the "Shinkansen" (Super Express Train "Kodama", 50 min. ride).
Please see the following web page for the "Shinkansen" time table;
http://train.sppd.ne.jp/train/sche/index_e.php
If you don't have "Shinkansen" ticket yet, you can buy here, Shinkansen floor, too.
If you get language trouble, you can also see English on vending machines.
The Tokyo station is so large as you easily get lost.
(Click an image for detailed information.)
Please follow this "Shinkansen" symbol (blue), then you won't miss. (Narita express platform: Basement 5, Shinkansen floor: upper level; You need to walk long distance.)
NOTE:
xThis green symbol goes to different directions.x
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