You can rent the Moose dining area for your group and have a private party. Cost is ¥10,000 for the first 2 hours and ¥2,000 for each additional hour. You can also rent it for the weekend for your large group for ¥20,000 Price includes using the kitchen, BBQ and seating for 20 guest.
Price
¥10,000 / Once / Per Accommodation