Time Escapdae: Five Seconds Till Climax (1986)

Tokyo, 1986. Every night Etsuko (Kozue Tanaka) 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?