Hi! I’m booking for December 22 for my upcoming family trip which includes 2 children ages 6yo and 3yo. Website says children’s tickets have to be bought at the ticket office in Shibuya Sky and not online (unlike Adult tickets). I am worried that the tickets for kids on the day might get sold out. Can I just buy adult tickets for all including the children so their slots are secured? I am aware of the price differences and it is okay. Thank you in advance!