Tokyo, 1986. Every night Etsuko abandons herself to solitary pleasure, while fantasising about her boss with whom she is in love. One evening, more turned on than ever, she experiences and earth-shattering orgasm - a climax so powerful it unleashes an "ecstatic energy" that transports her through time. In the strange new Tokyo of 2001, Etsuko meets herself, fifteen years older. She has a husband, but their "future marriage" is on the rocks... and there's a son. To put things right, she must travel back to 1986. But how?