Last episode of AdaShima didn't make any sense to me. They ended up nowhere in my book. Series ended and Adachi hasn't even confessed nor does she know what she wants to do with Shimamura lol.
Wasn't that a foregone conclusion? The novels progress at the rate of a lead ball in a glacier- heck, even the second manga adaptation, which speeds things up significantly, wouldn't have gotten anyplace definitive in a 12 episode run. The anime production team had three choices- they could either a) respect the spirit of the novels and recapture the lazy, hyper-introspective pace at which the story is told, b) skip enough content to get to a significant stopping point, which would piss off source readers and also not fit the tone of the story, or c) create an anime-original ending, although this would require the author's counsel and approval and be generally very complicated, not to mention dissatisfying regardless. An anime adaptation is first and foremost a sales-booster for the source, and by putting AdaShima on screens across Japan and making watchers curious where they'll go, the anime ends up attracting them to the LNs. From that perspective, it probably succeeded.