Ifm afraid that if I arrive at opening time (10AM) or later, I would be waiting in line The best scenario I think of is that you will apply for your rail tickets in the night of the 22nd and reach Makuhari Messe before 09:30 in the morning of the 23rd.
There are trains which run on Musashino Line and Keiyo Line's short section, some of which end in / start from Kaihimmakuhari Station.
You have chances to take a Sobu Line train from Ochanomizu / Akihabara then make a transfer in Nishi-Funabashi to such a Keiyo Line train.
[Timetable for weekends]
Ochanomizu: Track 3
( 07:21 / 07:56 / 08:11 )
| Sobu Line Local
Akihabara: Track 6
( 07:23 / 07:58 / 08:13 )
| Sobu Line Local
( 07:49 / 08:23 / 08:39 )
Nishi-Funabashi
( 08:03 / 08:35 / 08:50 )
| Keiyo Line Local
( 08:15 / 08:47 / 09:03 )
Kaihimmakuhari
Please note
that Keiyo Line trains starting from / ending in Tokyo do NOT run via Nishi-Funabashi
and that transfers in Tokyo Station to / from Keiyo Underground platforms are long both in time and distance.
If you do not apply for your rail tickets in the night, then you can do so in Tokyo Station from 05:30 at earliest; in that case it sounds better to make a long transfer to Keiyo Line then take a Rapid / Local train destined to Soga.
I still feel it would probably be better for me to do my ticket buying and such after a nightfs rest If you are anxious about your rail tickets, I recommend you in advance make a perfect list of your Shinkansen / Ltd. Express / Express trains and a rough itinerary of when and where you will be, both in alphabets and digits, then print them out or write them down on a piece of paper.
For trains taken without a rail pass, maybe the staff of a JR ticket office in Tokyo / Ochanomizu / Akihabara Station will prepare your tickets while you will be away for a while, if you hand the piece of paper, identify yourself and promise that you will be back soon to purchase them by a certain time.
: In Tokyo Station, a JR ticket office located near Yaesu Central Gate in open from 05:30 to 23:00.
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http://www.jreast.co.jp/e/stations/e1039.html: In Ochanomizu Station, the only JR ticket office is located near Ochanomizu-bashi Exit and open from 08:00 to 20:00 on weekends. From your hotel, this exit is at the further end.
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http://www.jreast.co.jp/e/stations/e384.html: In Akihabara Station, a JR ticket office located near Electric Town Ticket Gate is open from 08:00 to 20:00 on weekends. Presumably your hotel is closest to this gate.
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http://www.jreast.co.jp/e/stations/e41.htmlFor trains taken with a rail pass of JR, please get the rail pass first in Narita Airport / Airport Terminal 2 / Tokyo Station then apply for your tickets, handing the piece of paper.
: Ticket counters in Tokyo Station for rail pass applicants are located near Yaesu North Gate.
Trains departing from NRT do NOT run via Ochanomizu or Akihabara Station.
They arrive to one of Sobu Underground platforms in Tokyo Station.
On a rapid train on Chuo Line, Ochanomizu is the second stop after Tokyo, next to Kanda.
On a train on Yamanote loop Line's inner track, Akihabara is the second stop after Tokyo, next to Kanda.