Genma-san, I just started watching a drama on Crunchyroll called "The Perfect Insider" (original Japanese title is "Subete ga F ni Naru" or すべてがFになる, based on a 1996 novel - the original airing started in October of 2015.)
It's a series of locked-room mysteries and I'm liking them lots. They're much better than typical "whodunit" mysteries because you are presented with the same facts as the two main sleuth characters, which means you can take guesses at the solution before it's actually revealed. (I'm 0-3 so far, so I'm not much of a detective.)
Here is the official Fuji TV site in Japanese and English:
...and the series trailer:
I can go get all of the cast data if you want - but it would probably take me a lot longer...