Four Asakusa Stations are in different station buildings, I should say.
The three station buildings
of Toei Subway, of Tokyo Metro and of Tobu
are standing in a row, in this order from southwest to northeast.
Asakusa Station of Tsukuba Express
is apart from these three Asakusa Stations.
You pass through one of the two Toei Subway underground gates,
go out to the ground,
and walk to the main entrance on the 1st floor
(= the ground floor) of Tobu Asakusa Station.
Tokyo Metro,
when you would not take a train,
basically does not give you admission to its station.
Regarding Asakusa Station,
currently there is no special rule to let you get through the area inside the Tokyo Metro ticket gates.
- Maps (in Japanese)
for Asakusa Stations of Toei Subway and of Tokyo Metro
: Toei Subway Asakusa Station is on the left.
(1) Map on the Toei website
https://www. kotsu. metro. tokyo. jp/subway/stations/asakusa/i/solid. png
(2) Map on the Tokyo Metro website
https://www. tokyometro. jp/station/yardmap_img/_station_%E6%B5%85%E8%8D%89__yardmap_images_yardmap. jpeg
Are there escalators or lifts within the station/s? As you see in the two maps,
the Toei Subway exits on the side
which is closer to Tokyo Metro
(therefore closer also to Tobu)
are not equipped with elevators or escalators.
To avoid stairs,
you have to choose the Toei Subway gate on the further side;
then you take the elevator up to Exit A2-b on the ground.
From the main entrance of Tobu Asakusa Station,
you can go up by elevator or escalator
to the concourse on the 2nd floor;
then you pass through the nearby ticket gate.
- Map (in Japanese) for Asakusa Station, on the Tobu website
http://railway. tobu. co. jp/guide/station/insidemap/img/1102_image01. gif
When you would like to use Tobu Limited Express (#)
and do not have the ticket yet,
you before your ride visit the Tobu ticket office on the 1st floor
and purchase there the Limited Express ticket.
(#) Tobu Express (without "Limited"), Section Express and Limited Express are distinguished.
are the 2 stations close by ? It seems about 450 to 500 meters to walk
from Toei Subway Exit A2-b to Tobu Main Entrance.
(1) You get off the elevator
to Toei Subway Exit A2-b on the ground,
which is near a crossroads.
(2) You turn to the right, walk a little,
and take the nearby crosswalk [zebra crossing].
(3) You walk for a while, taking a crosswalk on the way,
and get to the next crossroads.
(4) You take the nearby crosswalk, walk a little more,
turn to the left, and take another crosswalk.
(5) You see on your right Tobu Asakusa Station Main Entrance.