On a rainy summer day, Dr. Aosawa's esteemed family held a big celebration at their home with many guests. But the holiday ended in a terrible tragedy - all those present died in terrible agony from the poison contained in the drinks. The house turned into a mortuary... Only young Hisako, Dr. Aosawa's blind daughter, survived, she didn't drink anything. But her interrogations yielded nothing - they only confused the police even more. “Blue room… White flower… Very scary…”The case was closed when, in October of that year, the main suspect, a young man who delivered drinks to the house, committed suicide, leaving a note confessing his guilt. But years later, Makiko Saiga, a friend of the survivor Hisako, began her own investigation. After interviewing many people who remembered that day, she wrote a book that became a bestseller. Makiko is convinced that she has solved the puzzle correctly and knows who the real killer is...