Yes, Tokyo Disneyland and Tokyo DisneySea sell out very frequently, and the resort has moved to a mandatory "Fixed-Date" ticket system. Unlike the U.S. parks, you cannot simply walk up to the gate and buy a ticket on the day of your visit. Tickets typically go on sale two months in advance (on the same date of the month at 2:00 PM Japan time) and often sell out for weekends, public holidays, and popular seasons like Sakura (Spring) or Christmas within days. Because the Tokyo parks are primarily visited by locals rather than international tourists, the "Golden Week" in May and the Obon holiday in August are guaranteed sell-outs. To secure entry, visitors must purchase tickets via the official Tokyo Disney Resort app or website. If the official site is sold out, some travelers find success through authorized third-party sellers like Klook or by staying at a Disney-branded hotel, which guarantees the opportunity to purchase tickets even when the general public allocation is exhausted. It is also important to note that Tokyo Disney does not currently offer a "Park Hopper" option for standard one-day tickets, so you must commit to one park per day, making early planning and ticket acquisition a critical part of a Japan travel itinerary.