After overtime makes him miss the last train, a man accepts senior coworker Yuika Onosaka's invitation to stay at her home. He has almost no ulterior motive until a sudden downpour soaks them on the way and makes her bra visible through her clothes. The sight instantly destroys his self-control. He pushes her down, and when she shows that she wants it too, they fuck until morning, pounding her huge H-cup body and ending with creampies.