Be careful of ticket resale sites!
-Check if it is the official sales site-

< About QR-ticket >
Screenshots and printouts of QR tickets are invalid.
Please view from the Ticket Oosumo website or the distributed URL.

The sites listed below are not official sites to purchase Sumo tickets. Please be aware that our organization is not responsible if you are denied the entrance to the arena or any other trouble that might occur. Only tickets issued on paper or QR-code tickets will be accepted. Tickets purchased via unofficial sites will be refused entry.

・viagogo
・BuySumoTickets
・StubHub
・ticketstreet
・ticket ryûtsû center
Others, Yahoo auctions, internet purchase via mercari.

< TROUBLE CASES >
・“The ticket I bought on these sites was fake.”
・“I couldn't receive my ticket.”
・“They couldn't accommodate cancellations.”
・“The price is more than twice as much as on the official website.”
・“I purchased the Masu Box(for 4people)from this site, and ended up sharing the box seat with another customers.”

The official Sumo ticket purchase site is here.