How to get to kayabaco station

Dear All.
I will be arriving Tokyo station ( south yaesu entrance) from Narita airport by airport shuttle bus. My hotel is 5 min walking from kayabacho station. I am wondering which option is better.
1. Walk to otemachi station. Catch Tozai line to kayabacho station.
Or
2. Walk to nihombashi station (10 to 15 min walking ), catch Tozai line to kayabacho station.

Is there a walkway or tunnel that i can walk to otemachi station from tokyo .How far is the walk? Any other suggestions?

What entrance should i enter at nihombashi station to catch the train to kayabacho A1 or A3.

Thanks

From Narita bound bus stop at Tokyo station, Nihonbashi station is nearer, because Otemachi station is on the opposite side of Tokyo station and over its broad zone of rails.

Tokyo Station ( South Yaesu Entrance) from Narita Airport by airport shuttle bus.

By the Access Narita bus?

My hotel is 5 min walking from Kayabacho Station.
Any other suggestions?

The easiest way, I think,
is to take a taxi from Tokyo Station Yaesu South Entrance.

When your taxi goes smoothly,
it brings you in several minutes
to Sotetsu FRÉSA Inn | Keio Presso Inn | Smile Hotel
near subway Kayabacho Station;
the taxi fare is estimated at 570 to 730 yen per car per ride.

A backpacker who knows in advance a good route
can walk for about 700 meters
to subway Nihombashi Station Entrance A7 around the west end,
which is nearest among the entrances equipped with an elevator.
https://www.tokyometro.jp/lang_en/station/nihombashi/yardmap/index.htm...

To get to any of the above three hotels, however,
you walk for about 200 meters more
to around the opposite end of subway Kayabacho Station.
https://www.tokyometro.jp/lang_en/station/kayabacho/yardmap/index.html

to catch the train to Kayabacho A1 or A3

What is your source for "A1 or A3"?
Subway Kayabacho Station does not have an exit of that number.

...You also can just walk from Tokyo Station... It's not that far. I use to stay at the Center Hotel pre-kid and I regularly walked to and from Tokyo Station, with bags. Even the Hotel Villa Fontaine is only 1.6 kms from Tokyo Station, and that's one of the furthest hotels. The Tokyo Station area tends to have wide sidewalks, so I find it a lot easier to walk, even with suitcases.

Good luck!

Thanks guys
Much appreciated. Arrived Tokyo at 10pm and it was raining. My initial plan of walking to nihombashi station changed. Instead we to caught a taxi and it only cost us 750yen which is reasonable.