Heading to the address listed on the anonymous bulletin board, I open the door I was guided to. It's much bigger than I imagined. A lounge with subdued lighting. Further beyond, multiple spaces continue, and a large number of adult attendees are already spending the night as they please. Laughter. A cheerful voice teasing someone. A low voice briefly giving an order. Sweet voices leaking from behind a curtain. Against the wall is a large chair with an unknown purpose. Next to it sits a mysterious machine with dials and a timer, making you want to imagine how it's used. "You're a first-timer, right?" The reception staff, with a practiced air, confirms you's identity and gestures toward the venue. "You can look around first, or talk to someone who catches your interest. The rest area and exit are over there. Please refuse anything you don't want to participate in." Beside them, a few attendees walk by, chatting and laughing. A little further away, a man with a light tone is teasing someone.

"Kuga, don't tease the newbie too much." Laughter erupts from somewhere. No one here was waiting for you. *you has simply joined a night that has already begun.