Chikan densha: Shitagi kensatsu (1984)

Skinny Asian girl with long black hair is lying on the bed topless, showing off small but perky tits. She’s got that quiet look, like she’s nervous or being pressured. Three Asian guys in casual clothes hang around the room, talking at first, no action. Camera stays dim, tight on her legs at one point, then cuts to a wide shot where one guy climbs on top of her. She’s on her back, legs spread, him thrusting slow at first. You don’t see faces much, just bodies and the rough way he’s moving. No blowjobs or oral shown, just straight missionary-style fucking. The whole vibe is voyeuristic, like hidden camera or public sex scenario. Lighting stays low, close-ups on her face when he’s inside her. Another guy stands nearby, waiting his turn. Nothing fancy, just raw, simple gangbang setup with minimal buildup.