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The sisters were brutally murdered one after another, but the brutal murderer actually came from the painting? The dreamy masterpiece of new mystery writer Yoi Takahiro! The wealthy businessman Katakura Yoshihiro has four daughters with artistic talents. With the unexpected death of Shiori, the youngest with excellent painting skills, the relationship between the three sisters Hatsune, Mifuyu, and Yuka becomes subtle. Many years later, Katakura Yafuyu has become a world-famous mystery writer with many book fans, one of whom is university student Tagen Ri. Because of an unexpected encounter, Ri received an invitation from Mito and went to the Katakura family's villa with her friend Hideyuki to attend an April Fool's Day party. In the villa decorated with portraits, murders followed one after another, and the Katakura sisters were murdered one after another. The atrocity naturally made all the guests at the party angry, but what was even more chilling was that various signs at the crime scene showed that the murderer seemed to have come out of the portrait, and Shi Zhi was no longer in the world...