Yokohama baseball tickets 25/9

I'm going to be in Tokyo and originally wasn't going to be able to make any games, but I've now got a free night on the 25th September and saw that Yokohama are playing Yomiuri. As with a lot of games, it's sold out.

Anyway I could track down tickets? Either online or on the ground in Tokyo? I've seen tickets on ticket.co.jp but that seems tricky to deal with from afar.

Thanks!