A married woman targeted by her neighbor

Kana, a full-time housewife, is worried about her son, Takashi, who is studying for the entrance exam, who lives next to her house, constantly plays with Tatsuya, a bar exam ronin who lives next to her house. I wished that I wouldn't want him to become a bad adult, like Hanaoka, the widow who lives next door, even if I had the wrong idea...