I called one day before to make a reservation. However, when I got there, they didn't have my reservation (even if I had to give my credit card number). Luckily, the problem was quickly solved and they gave us a table.
I can confidently say that their drinks/cocktails are amazing. We pretty much ordered every drink/cocktail on the menu and were very pleased with all of them. However, they are a bit expensive for the amount we get (most are 9$).
We came to Imadake for the drinks, beer and the Sake bomb (a must-try!) but the waitress told us we had to order something to eat since it's a restaurant. I ordered takoyaki and was quite impressed. However, the portions are quite small since it is mainly tapas. It can get expensive if you have a big appetite or are very hungry.
Despite having a ton of tables, our waitress managed to give us a great service. She was very transparent and funny and also helped us for our orders.
Overall, I would come back for the drinks and the loud and vivid atmosphere and the good service although it can get quite expensive (this is coming from a student's perspective).