Hanshin Tigers Advice on Tickets

Hey everyone, I am going to Japan in April, and the game on the 7th lines up perfectly with my schedule.

I am planning on proposing earlier in the morning in Osaka, and am really hoping to get tickets to this match. What is the process like? Right now it seems impossible, especially without being a Japanese resident. If anyone can give me some advice on how to secure tickets, this would make our day extra special :)