Mariko is a very dedicated wife married to the husband, Hiroyuki, who is hospitalized with an incurable disease. She misses him quite a lot and she has been enduring her libido for quite a while now.
One day, Mariko gets on the commuter train on the way to go visit her husband, and she bumps with her nephew, Yukihiko. They feel a strange attraction between them that turns in to lust as Mariko loses her control.
At the same time, Mariko’s neighbor, Kaoru, notices the happening… much to her disgrace.