Ado's music tour

Hello, I expect to arrive to Japan at the start of July, I was thinking of going to one of Ado's music performances but having trouble understanding how to order tickets/enter the lottery, also having trouble understanding the difference between tickets (A/S/VIP). I am going to have a Japanese number once I arrive to Japan but until then I won't. I'd like your help understanding and have the oppurtunity to go to Ado's show 🙏 Thanks in advance!

EDIT: Reviving the post - I hope there's no issue with that. So I am in Japan! Got my japanese phone number and I'm about to buy a ticket to the performance in Hokkaido, now the question that's left is which seat to pick... I still have no clue what the difference between the A/S/VIP seats is. Does anyone know? Looked all over but couldn't find an answer.