Can i buy japan alps ticket in advanced?

I plan to Japan alps route & plan to early start (before 7 am) from Dentetsu toyama so i want to know "Can i buy ticket on day before?" Because i know that ticket office will open at 7.00 am.

Are you planning to do this trip:
http://www.japan-guide.com/e/e7550.html

Unsure why you need to purchase ticket the day before. You could just easily buy the ticket on the day you are travelling . That was what we did when we visited the place.

Thank liem,i mean i want to go very early before ticket office opening so i have to buy ticket on day before travelling.

ticket office will open at 7.00 am.

Assuming your information is correct. You are taking earlier train than 07:00, therefore you are unable to purchase ticket. I am sure you might be able to pay on board or very likely at the arriving station.

Only a few days of Golden Week last year, sales of the ticket was held in Dentetsu Toyama station minutes to 5:10. Usually, leaving travelers from Toyama before 7:00, will be first to buy from the vending machine a ticket to Tateyama Station, then go to Tateyama Station by train, buy a ticket of Alpine route at the ticket counter on the second floor there.
http://www.alpen-route.com/en/transportation/ticket
From April 1, It is possible to book a ticket on the Web, but the location to receive it is a Tateyama Station.
http://www.alpen-route.com/ticket/en/index.html
It would be if the starting point if you're Nagoya or Osaka, it is also considering the purchase of Tateyama Kurobe Alpen Kippu sold in the JR company. Round-trip fee of it is 24,260 yen's departure from Osaka.
http://www.westjr.co.jp/press/article/2014/03/page_5394.html (Japanese)
http://jr-central.co.jp/news/release/nws001393.html (Japanese)