「突破狭小住宅」は、こがけん扮する一級建築士・古賀が大活躍。今回の依頼は15坪で正方形という狭いながらも比較的建てやすいスペースのように思えるが、依頼主の最大の願いは屋上バルコニー。しかし、建築基準法が大きな壁に。それに従うと屋上バルコニーを作ることが困難になるため、多くの建築士たちが依頼を断る原因にもなっていた。ほかにも、明るくて広いリビングや子ども部屋、駐輪場にシューズインクローゼットなど依頼主の夢は広がる一方。どんな条件でも依頼主の希望をかなえてきた古賀に秘策はあるのか?
In "Breakthrough Narrow House," first-class architect Koga, played by Koga Ken, plays a major role. The request this time was for a 15 tsubo (59 m2) square space, which seems relatively easy to build in, but the client's biggest wish was for a rooftop balcony. However, the Building Standards Act was a big obstacle. Following the law would make it difficult to build a rooftop balcony, which was the reason why many architects turned down the request. The client's dreams continue to expand, including a bright and spacious living room, a children's room, a bicycle parking area, and a shoe-in closet. Does Koga, who has made his clients' wishes come true under any conditions, have a secret plan?