Asahi Mizuno has been married for 1 year and things are going really well. One night, some friends come over to dinner and have some drinks. They drink so much that they all pass out there, but this friendo wakes up in the middle of the night and starts banging with Mizuno, who he mistook her for his wife.
After that, they keep on banging some more, because the first mistake felt pretty good.
On the last minute of this film the husband finds out, and he gets totally r3kt, it is implied that the husband kills himself afterward… Damn Japan, get your shit together.