Kokurojo: The Samurai and the Prisoner Film Production and Adaptation

Kokurojo, internationally known by its English title The Samurai and the Prisoner, is a Japanese historical mystery film directed by Kiyoshi Kurosawa and scheduled for release on June 19, 2026. Distributed by Shochiku, the production features a runtime of 147 minutes and is spoken in Japanese. The screenplay is co-written by director Kiyoshi Kurosawa and based on the acclaimed novel of the same name by Honobu Yonezawa.

Kokurojo promotional visual depicting the historical drama setting

Background and Literary Source

The film is an adaptation of Honobu Yonezawa's novel Kokurojo, which was published on June 2, 2021, by Kadokawa. The source novel achieved significant critical acclaim in Japan, securing several major literary awards including the 166th Naoki Prize in 2021, the 22nd Honkaku Mystery Award in 2022, the 12th Futaro Yamada Award in 2021, and recognition in the Kono Mystery ga Sugoi! rankings in 2022.

Plot and Premise

Set during a period of historical conflict, warlord Murashige Araki launches a rebellion against the tyrannical ruler Nobunaga Oda, retreating to his stronghold to withstand an external siege. As Oda's forces seal off the fortress, internal tensions rise among Araki's retainers. Amidst the ongoing military siege and emotional support from his wife Chiyoho, an unexpected murder of a young boy triggers a series of mysterious incidents within the closed environment. Because the castle remains completely cut off from the outside world, the perpetrator must reside within its walls. To resolve the mystery, Araki turns to the imprisoned military strategist Kanbee Kuroda, who is held within the castle's dungeon.