This is the weakest collection of Haruhi stories in a good long while. Since there was a huge gap between the conclusion to the massive 3-novel arc and this volume, I was hoping for more. Specifically, I wanted at least one of two things: a follow up on the mysterious cylinder found by Tsuruya, and the gift Kyon gives Haruhi for the anniversary of the SOS Brigade. We're given neither of these.
Instead, we have three stories, the first being short and sweet, and the last the length of a novel. The one in between is a bit hard to grasp in premise (which may be more of a translation issue) and overall uninteresting in execution. The novel-sized story is called "Tsuruya's Challenge," which gave me hope that it would be about Tsuruya challenging the SOS Brigade to solve the mystery of the impossible metal cylinder. Instead, we're given a different mystery for them to solve, and it's tedious and largely uninteresting to me.
Nagaru Tanigawa clearly enjoys writing mysteries, but he's consistently not very good at them. "Desert Island Syndrome" was engaging only because the threat felt real, and the actual detective roleplay part of "Snowy Mountain Syndrome" was absolutely lame. With "Tsuruya's Challenge" in particular, the mystery itself is unnecessarily drawn out with no real stakes. There's also a very long preamble explaining the inherent nature of detective stories to the reader, as acted out by Koizumi, Nagato, and new character T geeking out about their mutual love, while Kyon listens with annoyance. I get it bro, I'm annoyed too. The issue is that, without this boring and kind of hard to follow introduction, the reader will get lost over the course of the rest of the story if they're uninitiated in the formulae of detective novels. There's actually some good stuff in the framework of this story, though, as the deconstruction of the mystery genre within acts as a bizarre (possibly even intentional) metacommentary with the very narrative choices executed by Tanigawa in all of the Haruhi books. Within "Tsuruya's Challenge," a lot is argued between the characters on the nature of nicknames and untagged dialogue, both of which are features utilized by Kyon himself as narrator. Heck, we even have a new classmate of Haruhi and Kyon, whose German name is too complicated to bother with so is simply called T. In turn, T calls Kyon "Kyam" because it sounds easier on her tongue, which he of course hates more than his normal nickname.
My final thoughts on this volume are that, although I'm disappointed with the stories, it ended on a foreboding note that implies the mystery of Tsuruya's cylinder will soon be crucial (Koizumi ponders the nature of Chekov's gun here), and a potentially terrifying evolution in Haruhi's powers. This volume is unusual in its lack of anything remotely supernatural happening, and I wonder if it's a "calm before the storm" case. I also love the introduction of T, and I hope she becomes a regular addition to the roster of minor characters.