I’d really recommend a place in Shinjuku called ‘Medaka’. It’s a cheap Izakaya, and has lots of space if you have many guests you want to bring.
The food is party-style for sharing, and really good value for the amount you get and the quality of the dishes! Theres veggie options too, and both western and Japanese food.
The best part, beer is only 180 yen!!!!!
Hope you can try it!