JRPass

Hi there,

For Asakusa to Narita, your best option for speed will be:

1) Travel east on the Yellow Ginza line from Asakusa to Ueno via the Tokyo Metro
2) From Ueno, board the Keisei Skyliner direct to Narita.

You can find ticket purchasing information for the Keisei Skyliner online, however you should be fine to buy a ticket on the day at Ueno.

hope this helps!