I arrived at around 5 on a weekday, there wasn't a line and the ladies there were very nice. I got the original tiramisu and the Sakura cheese cake. Both of them were amazing. The best thing about Japanese desserts is that it's not too sweet and nice and creamy. The whole concoction is very well-balanced.
However, the prices they are charging for one of the mini cheesecakes and tiramisu is ridiculous. Definitely too expensive to indulge in regularly.