As the story goes...
A young, shy Japanese couple that had been married for fourteen years were too repressed to even consummate their marriage by making love.
Eventually, one day, after a bottle of plum wine, they tried again, and at which time they succeeded.
However, unfortunately for them, their hearts were not physically ready for such a shock, and they both died from cardiac arrest after achieving simultaneous orgasms.
This true story of strange death(s) was based on the deaths of Sachi and Tomio Hidaka from Tokyo, Japan. Not much else seems to be known about this story.