Has Hongye Solved the Case Today? [Crossover]

This story was originally titled The Case Files of Holmes Koyo. But Miss Haneda didn't like the title I chose. She said she wasn't good enough to be mentioned in the same breath as the great Mr. Sherlock Holmes. At the same time, though, she had the nerve to suggest I rename it The Great Detective Koyo. ...I don't think there's any real difference between the two titles. I just want her to put a hand on her conscience and see if it aches at all. You haven't even solved today's case. Why are you pretending to be Sherlock Holmes? But if I had to sum up the story in one sentence: It's the detective adventures of the great sleuth Haneda Koyo and her assistant Tessei. Featuring Black Butler, The Prince of Tennis, Detective Conan, Unnatural, The King of Singers, Durarara!!, Fate, Bakuman, Monthly Girls' Nozaki-kun, Brothers Conflict, and Legal High (so far). Pre-registration to avoid spoilers begins 2018.6.21. A companion piece to Has Sanada Solved the Case Today? (Crossover). Updates according to the rankings, at least 10,000 words a week. There are minor errors, so please don't read too much into them.