I'd like to buy the Koyasan World Heritage Ticket a few days before my trip so that I can take an early train. (I'm not sure of when the ticket offices open.) From reading (very) old post, I believe advance purchase is fine, right? I'll be in the Namba area and would like to buy it there at the Nankai Railway ticket office. However, I can't find clear information on where exactly the ticket office is. Most of the stations in Japan look huge and confusing - a lot of nuance between different rail lines and subways that have the same name. Where exactly can I find the ticket office, please? Thanks!