I think this case took inspiration from the real-life 1988 Junko Furuta case, which explains why it felt so familiar to me. The clues in this case are quite obvious, and the way the culprit handled certain things feels surprisingly careless. If Takato were to see this, he would probably be laughing at how sloppy the execution was. With the information revealed so far, I've narrowed down a few possible suspects. Now I'm curious to see whether my deductions align with Kindaichi's own reasoning once the case reaches its conclusion.