Buying a few Tokyu Tokyo Metro Passes

Can I buy a few Tokyu Tokyo Metro Passes when I'm alone at Daikan-yama Station? (I understand I can't buy the pass from Shibuya Station) Say if I want to buy 4 such Passes, then does 4 persons need to be physically there?

Would appreciate any help as I was not able to find the information. Thanks.

This is not "special" like "JR-Pass" valid for foreign travlers only type
one of regular discount ticket sales also for Japanese travelers.
No "sold out" and at Daikanyama stn possible no worry.
No sales at Shibuya right.

But sales only "on the day" by regular ticket vending machine
so No sales advance and at ticket office/counter/window.
Touch [English] button on screen first and no need purchasing
4 times each by each select travelers number from menu easy.

[fare/ticket info]
from Daikanyama[‘γŠ―ŽR] : 810Y/adult 410Y/child
http://urx.nu/emfP [PDF]
Ticket is "insert" type not touching like IC card Suica/PASMO.
Don't forget recieving ticket gate everytime carefully.

And... in Tokyo subway by only two different rail campanies
"Metro" and "Toei" so this pass not covered "Toei" lines.
Tokyu(include Daikanyama stn) is not subway rail.
Check again before arr stations strongly recommend.
[PDF]
http://www.tokyometro.jp/en/subwaymap/index.html
http://www.tokyometro.jp/en/ride/guide/index.html

Need transfer at Shibuya need or not depends on your plan.
Tokyu Toyoko line[“Œ‹}“Œ‰‘ό] trains (also Seibu,Tobu.Metro cars)
through-running@to/from Metro "Fukutoshin" line only
if to/from Metro "Hanzomon" or Metro "Ginza" line need transfer.
http://www.tokyometro.jp/station/shibuya/yardmap/index.html
(note)
All Rapid and Exp from Shibuya skipping Daikanyama carefully.
Shibuya is all to/from trains stop. (one big terminal as hub)
http://www.hyperdia.com/en/