橫溝正史的最高傑作，在諸多推理小說排行榜中佔據第一寶座的《獄門島》再次被搬上螢幕！！以戰爭剛剛結束的瀨戶內海的孤島為舞臺，毛骨悚然的氛圍加之精妙的殺人詭計——長谷川博己所飾演的金田一耕助與過去英雄式的演繹不同，性情古怪、有時裝傻充愣，心中卻隱藏著戰爭帶來的創傷，為了填補內心的空虛而忘我地投身於案件之中。“初春忽至、黃鶯倒懸枝頭、初啼聲聲”，封閉的孤島上展開的連環殺人案，不知為何被比作俳句的殺人之謎，新的金田一耕助將如何破解！？

終戦直後、瀬戸内の孤島を訪れた金田一耕助（長谷川博己）。僧の了然（奥田瑛二）の案内で島の実力者・本鬼頭家にやってきた金田一は、そこで美しい女性・早苗（仲里依紗）と出会う。さらには島に似つかわしくない奇抜な風体の３姉妹にも。そしてある晩、末妹の姿が消える…。

In 1946, on a fictional island called Gokumon-tou, located in the Inner Sea of Seto, the famous detective Kindaichi intended to pass his convalescence after the invitation of his war buddy Kitou Chimata, the successor son of the powerful clan of the Kitou Family. But Kindaichi arrives alone, bringing the bad news of Chimata's death. However, the truth is that Kindaichi is not on the island to recover. Before Chimata died, she uttered the words: "My sisters will be killed!" Indeed, as the three sisters are murdered one by one in horrible and strange ways, Kindaichi desperately tries to find the culprit and in the process discovers the intrigues of the family, secrets, island mentality, discrimination, and eccentricities, With the backdrop of the turbulent postwar period.