Mona Lisa no Heya(1971)

In the deep snowy forests of Sweden, Vincent Minnelli, a doctor, mistook a person for a deer on a hunt. The girl he shot at, Joanna, was unharmed, but she told Vincent a shocking story, and the next morning she disappeared without a trace. Later an envoy of the General Ambrose du Closter invited the doctor to Castle Scorchloster, a mansion on the lakeshore, because General Closter was interested in Vincent's research. Vincent went to castle and was introduced to the General's daughter, Mona Lisa. To Vincent's surprise, Mona Lisa looked just like Joanna. Vincent thought they were the same person, but Mona Lisa told him that she had never seen Vincent before. The others also confirmed that Mona Lisa had been in the castle the whole time, and none of them knew anyone named Joanna. Mona Lisa disliked her governess, Miss Corban, and adored her ailing mother, Camilla, but Camillia did not recognize Mona Lisa as her own daughter and hated her. The inhabitants of the castle are entangled in a complex web of emotions. Soon, Mona Lisa was at the mercy of a spectacular, bloodcurdling, and horrific love-hate drama. What is the fate of Mona Lisa in "Mona Lisa's Room," Masako Watanabe's masterpiece of bizarre romance? And what is Joanna's true identity?

(Source: Taiyoutosho, translated)

Note: Includes the one-shot "Shijin Keiyaku" (死人契約)