Shoko is a married woman living in an apartment complex who is troubled by a lack of sex with her husband. In the middle of masturbating to relieve her sadness, she suddenly looks up and meets the eyes of her middle-aged neighbor Nakata, who is peeking in through the window. Nakata comes to apologize later, and Shoko is relieved to see his honest personality. She begins to learn "poses that are useful for a married couple's night" from him, who aspires to be a yoga instructor. The two, who were never meant to meet, end up in an affair that is so intense that it makes them sweat after Shoko witnesses her masturbating...