Overview
Legend of the Demon Cat is a 2017 Xianxia fantasy mystery film directed by Chen Kaige, based on the novel Śramaṇa Kūkai (Japanese: 沙門空海 唐の国にて鬼と宴す) written by Japanese writer Yoneyama Mineo, known under the pen-name Baku Yumemakura. It was released in China in December 2017.
Plot
The story is a supernatural reimagining of the story of death of Yang Guifei. The movie opens with Chunqin, the wife of an army commander, making a reluctant bargain with a talking black cat. In exchange for the eyes of fish which are eaten by the cat, Chunqin finds a pot of coin which she shares with her husband.
The Japanese Buddhist monk Kukai is called to the imperial palace to assist Emperor Xuanzong who is cursed with a supernatural ailment. The Emperor passes away while strange cat wailings can be heard. Kukai makes the acquaintance of Bai Letian the poet whose major work is "Chang hen ge" - Song of Everlasting Sorrow (長恨歌)- the story about the life of the Emperor's favorite concubine Yang Guifei.
The commander's wife has lapsed into a coma. When Kukai and Bai Letian investigate they see an visage of Chunqin on the roof reciting a poem. Kukai believe this visage is that of a demon cat.
They research the poem being recited by Chunqin and learn that it was one that was composed at Yang Guifei's wedding banquet. They decide to visit Yang Guifei's abandoned residence. Inside they see Chunqin's visage. The visage explains that she was once Yang Guifei's beloved cat. She explained that she was buried alive but was allowed to escape. It became a demon cat in order to exact revenge. The cat later possess the commander and while possessed he kills Chunqin. The commander goes insane.
From Wikipedia (CC BY-SA 4.0).