I have watch so many videos in preparation for my trip and they all say you need to buy the pass online before the trip. However, I plan to buy this way cheaper ticket and go during the periods you can use it. Its not in the period you buy it yet however it is in the period you buy the summer pass so I did look and I don't see any way to buy the pass. I googled buy Seishun 18 and all that I see is information on it, no way to buy. Do you buy normal JR passes online a head of time but these you can actually buy there. Oh also, I did see where to buy these and they were all at Tokyo stations so that seems obvious but I am confused by all these videos saying otherwise.
Thank you for your time!!! I do hope you have a wonderful day :)