our trip will last 18 hours because we must change planes in Korea. So, do you have a certain reason to fly into not Tokyo Haneda but Narita?
Narita Airport [NRT] is actually outside Tokyo.
Haneda Airport [HND] is much closer to Shibaura, Minato City, Tokyo.
Toei Mita station is right next to JR Tamachi Station, and has some direct services from Narita To use a (72-hour) Tokyo Subway Ticket
first from Oshiage to Mita,
even when you catch a Keisei - Toei direct train,
I suppose you should disembark at Oshiage Station.
The time limit for this subway pass is set by a gate machine
when you first get through a Tokyo Metro or Toei Subway entrance gate.
You cannot get it retrospectively
after traveling into the subway network without the pass.
I will be in Narita at 18:30 a Sunday in July A JR Rapid train leaving the airport for Kurihama
continues beyond Tokyo Station onto Yokosuka Line as a Local train
and makes a stop at the next Shimbashi Station.
Narita Airport (19:35) -- Airport Terminal 2 (19:38)
-- (20:59) Tokyo (21:00) -- (21:03) Shimbashi.
Narita Airport (20:08) -- Airport Terminal 2 (20:11)
-- (21:32) Tokyo (21:34) -- (21:37) Shimbashi.
Narita Airport (20:30) -- Airport Terminal 2 (20:32)
-- (22:04) Tokyo (22:09) -- (22:12) Shimbashi.
- JR-East: Shimbashi Station
https://www.jreast.co.jp/e/stations/e877.html: Trains from NRT arrive at Underground Track 1.
Then,
you can change platforms
and take a Local train departing at Track 3 or 4 to Tamachi Station
or,
you can get outside the ticket gates,
make a short transfer to Toei Subway (Asakusa Line)
and take a train departing at Track 1 to Mita Station.
-Toei Subway: Shimbashi Station
https://www.kotsu.metro.tokyo.jp/subway/stations/shimbashi/i/solid.png: Toei Subway Asakusa Line is shown in rose.
: Tokyo Metro Ginza Line is shown in orange.