It's ironic that one of the biggest threads on this forum is about a non-yuri manga.
You know, I begin to wonder if the people calling this non-yuri, particularly after the last chapter, have even bothered to read the story.
After all, there's a lot there that points to Ran being gay as hell for Keiko. The honmei choco, the dream, the naked hug, a lot of little hints that get passed off as jokes. There's really no doubt about how Ran feels. As for Keiko, she's been very close with Ran all the way through, and says as much on several occasions. But most significantly in the last chapter she acknowledges the naked hug happened and doesn't make fun of Ran for it. In context, that's Keiko taking it seriously.
And now, while there hasn't been an actual confession they have made it clear they'll remain in touch and Keiko gets to have time separated from the situation to work it out in her own head. Exactly like she did with her other major issues, her ex and her mom.
Personally, I find it difficult not to see this as basically a standard yuri story, just with the last couple of pages missing. Sure, we didn't get a confession or a kiss, but the door's wide open. That's why I think the "It's not yuri, HA HA!" (insert Nelson Muntz gif here) crowd is at the very least more wrong than the "Why didn't they have science babies" faction.
But that ambiguity and subtext isn't what bugs me about the ending, as I've said several times before.