In August, 1924, before his death, Senzaburo wrote his last work, "Koheiji, who is alive," on "Engeki-shincho" (Bungeishunju Ltd.), which is recognized as his defining work, and also as a masterpiece in the history of modern plays.
逝去に先立つ同年8月、『演劇新潮』（文藝春秋）に発表した『生きてゐる小平次』が絶筆となったが、これが代表作とされ、近代戯曲史上の名作とされる。