Using high tech of Japanese Toilets, "Washlet":

When you land on Narita Airport and enter the bathroom, you will find strange buttons beside the toilet (like the one in photo). This is what we call "Washlet".

The high tech toilet "Washlet" comes with warm toilet seat, a bidet spray that extends from under the seat to jet warm water, and a dryer, as well as a remote control to adjust toilet seat and water temperatures.

If you feel uneasy what happens on pushing any of these buttons, you will be recommended not to touch any buttons but just flush water.

When you are curious enough to experience the effect of the bidet spray, note that you remain seated on the seat. Otherwise, the water flushes outside the toilet bowl and will wet the floor of the toilet room.

Here is how to use "Washlet".

Step1:	Open the lid.
Step2:	After you have finished, press the "green" button (see photo 1) to jet warm water. The spray nozzle can be moved back and forth by the remote controller.
Step3:	Press the "orange" (see photo 1) button to stop the spray.
Step4:	After washing, press the "DRY" button to blow warm air and dry refreshed; then, press the "STOP" button to stop drying. If the "DRY" function is not equipped, use the toilet paper to dry.
Step5:	Finally, press the "FLUSH" button to flush the toilet bowl clean.

Using Japanese Squat Toilets:

A squat toilet is a toilet used by squatting, and it consists of a hall in the ground.

To use a Japanese squat toilet, stand over facing to the high side. Put down your pants to your knees, and squat down over the toilet bowl.

NOTE:
In some public bathroom in Japan, toilet papers are not provided. It's good to carry a pack of pocket tissues with you.