IC card is a rechargeable smart card which is issued by railway companies. It is getting very common ways to travel in these days. Once you have this card, ticket purchasing is not required. It gives you convenience. But there are many types of card available. And it is so hard to find which train and bus are covered by these cards.
If you will arrive in Narita and stay in Tokyo for several days, Suica & N’ex may be suitable for your stay. This ticket includes Narita Express ticket and 1500 e-money in IC card “Suica”. Suica can be used for both JR train and subways in downtown Tokyo. You can use this ticket for almost any trains when you stay in Tokyo.