Her father-in-law lives in an apartment in the next town over. Kanna, a serious wife, has never had a good relationship with her husband's father, who loves drinking and gambling and has a rough temperament. When she and her husband visit her father-in-law's house, she sighs upon seeing his dilapidated room, where he continues to lead a decadent lifestyle. The following week, she visits his apartment alone to deliver some government documents. However, there, her father-in-law becomes aroused by her defenseless female body...