Tokyo, December 30th, 2000. The last night of the millennium. A family of four in a small house in Setagaya Ward went about their evening while the city celebrated. Mikio was 44. Yasuko was 41. Nina was eight. Rei was six. Someone climbed through the upstairs bathroom window. Rei was strangled in his bed. He was six years old. No blood was found on him. Mikio heard the noise and came upstairs. He was stabbed with a knife the killer had brought. The blade tip broke and lodged in Mikio's skull. The killer found a kitchen knife in their own home to finish what he started. All four members of the Miyazawa family were dead. Then he stayed. He sat down at the family's computer and browsed the internet. He ate their ice cream. He used their toilet. He did not flush. He slept in their house. As Tokyo counted down to the new year outside, he was still there. He left just before dawn on New Year's Eve. Yasuko's mother arrived that morning and found them. He left behind a mountain of evidence. Fingerprints, DNA, his personal belongings, the food he ate, his blood on every surface. His DNA showed mixed heritage, European maternal lineage, East Asian paternal. No match in any database anywhere, ever. On December 30th, 2025, 25 years after that night, Tokyo police stood at a train station and put out the mannequin again. The same clothes, the same platform, the same appeal every year. The case is still open. If you need help, reach out. You are not alone. He left fingerprints, DNA, his belongings, and an unflushed toilet. Who stays in a house all night after something like that? And what does that tell us about who he is?