建築家の桑野信介は、前作で良い関係になりつつあった早坂夏美とは破局し、53歳になっても「まだ結婚できない男」だった。
そんな中、正体不明の「やっくんのブログ」で自身のことを酷評され続けたことから、そのブログを止めさせるために、弁護士で独身を続けている吉山まどかに法律相談することになる。
Kuwano Shinsuke, a successful architect, is well-to-do, knowledgeable and good-looking. He is now 53, still lives alone in the same apartment, which has the latest gadgets, and enjoys a single life. Although he fell for Hayasaka Natsumi, the doctor who treated him and changed his perspective toward marriage, and even dated, they later broke up. So Kuwano’s heart is shut firmly to love again. He is even more eccentric now and feels a little anxious when he thinks about the future. One day, the wheels of fate start to move all of a sudden after a chance encounter with some women.