I've been to Han MAchi a handful of times and decided to have my birthday party of 15 there. I made the reservation at 11am the day of, providing my contact information at their request.
Upon arrival, the restaurant was busier than i had ever seen it and there were no tables available. My party waited in the lobby for 30 minutes after my reservation time before some guests became restless and started to leave. The staff scrambled to ask other guests to move to other tables and cram us into what tables they could scoot together.
There was one overwhelmed waitress trying to serve the entire table. Dishes all came out at different times. One guest was served an hour and a half before others. They even brought out some mochi with a birthday candle in it for me before i received all my dinner.
Many guests canceled their orders after waiting for two hours. They did not apologize or offer to erase any items from the bill to compensate.