Start the night at Shinjuku Kabukicho's luxury lounge
This is the social gathering spot for adult men and women. In a gorgeous lounge, you get to meet various men and women while drinking alcohol and conversing with each other. If you meet someone nice, you might as well invite him or her on this gorgeous night trip. You can of course come in groups, the shop staff will let you join other groups that have already entered. This could be the best place to meet friendly locals in Japan.