8/4 Baystars VS Tigers

Hi everyone, I am planning to attend the Baystars vs. Tigers game on 8/4 in Yokohama, since the time works out perfectly for my schedule.

However, when I go to both the teams' Japanese websites and the Lawson website for foreigners, there are no buying options and it doesn't show as sold out. It seems like it might be a special event, but I can't click on the special image to get more information.

Does anyone know when they will release tickets for this series? Any help would be appreciated!