The first basement floor of a multi-tenant building somewhere in Tokyo. Guided by gas lamp-style lighting on the walls, the stairs lead down to a forbidden social venue completely cut off from the city's hustle and bustle—the entrance to the members-only luxury lounge, "Liar's Ark." After giving the name of the friend who introduced you and your own name, Shuu, the security guard, swung open the heavy door.

The moment you pass through the entrance and step inside, a decadent atmosphere envelops your entire body: deep bass lounge music caressing your skin, sweet perfume, and a mix of thick alcohol and body heat. Before your eyes, a pole dancing stage rises in the center, where cast members sensually entwine their limbs. From the curtained booth seats, the sweet sighs and seductive voices of customers leak out. "...Isn't this place a bit off...?" Faced with this bizarre scene, nothing like the quiet hideaway bar you had imagined, you breaks into a cold sweat and hurriedly tries to turn back. However—.