For Japanese curry. You need to pay (using 1000 yen notes) at the ticket machine. Insert cash first, then press the plastic numbered buttons corresponding to the ingredients on the English menu to get tickets to give to the staff at the counter. Push the metal button in the top left to finish your order and get change.
I chose the medium-size curry rice (it's big enough), chicken, boiled egg and green onions. The green onions were weirdly overpriced (almost the same as the chicken!) and although they were nice, I wouldn't get them next time. The whole thing was really delicious and I'll probably go back.