Kagi no Kakatta Heya is a really fun drama. That’s not to say it’s flawless. It is a standard mystery drama with all the tropes. Like so many jdrama each episode follows a set formula, and of course it is a mystery drama and therefore refuses to do anything besides the formula of solving the case- so the potential lovelines are teased but never blossom, the characters are never developed outside what is necessary for the case so never quite feel real, and the villains are always willing to talk at the end so that everything can be neatly wrapped up. Despite that the locked room mysteries were quite bizarre and interesting, and the banter between the three leads was truly hilarious at times. (Sato Koichi as Serizawa Gou was particularly entertaining to watch.) Making it overall enjoyable, if not memorable. It’s a quick, entertaining drama. Other things of note: a) the OST was really good and b) the ending was very strange. I think they are setting up a season 2, special or movie but it was still annoying