Yui is a housewife who commutes to her part-time job by train. One day, she offers her seat to an elderly man who appears to have trouble with his legs, but this is the beginning of a nightmare... The old man sees Yui as his late wife and begins to stalk her violently. A mysterious present arrives at Yui's house, and she senses something approaching her from behind on the commuter train... Yui is frightened and cowering, and the old man's obscene fingers and tongue mercilessly penetrate her body!