Chikan densha: Sawatte shukkin (1987)

This one’s all about public groping. A slim Asian teen with short black hair is the focus here. She’s on a crowded train, and some guy starts touching her up. It’s not just a quick grope — he takes his time, squeezing her tits and sliding his hand down her pants. She plays it off like nothing’s happening, but you can tell she’s into it. The camera stays close, so you don’t miss a thing. Later, she’s in an office setting, still teasing the guy. They don’t fuck, but the buildup is solid.