Makuhari Messe - Concert - Standing areas

Hey there

So, I've googled the hell out of this and can't seem to have any luck, and hope somebody familiar with the venue can help me out.

I'm attending the Babymetal concerts on the 13th/14th
I've already figured from this forum how Japan concerts work with queuing, that it goes by your ticket 'number'. However, I've also come across a seating chart for this venue that suggests the floor has A B C and D areas, and that the tickets (which are all standing) have these numbers assigned.

Does this mean that if I have a B or C ticket that I will be standing in a particular area (behind A tickets), or is it just for entry purposes?

Anyone who is familiar with the venue, some knowledge would be most appreciated, though I've probably left it too late to find out.

[A] ticket holders are [A] area(block) only.

Entering make lines before at out side
with calling 10[A001-A010] or larger numbers group each.
Then enter line from small ticket number holders as front.

整理番号[seiri-bango] is so.

Right,

So there are actually dedicated standing areas inside, ( So if you don't have an A ticket, you won't get to the front? )

Seems like a big lottery considering all the tickets were the same price. Only hope I got an A ticket.

Thanks.

Your ticket and seat are both reserved. If you have a "B-1012" ticket, then you need to go "B" section, then find "1012" seat. You can't sit or stand other than the ticket number.