If the studio is really serious in getting a second season, maybe volume 4 won't be in S1. But otherwise, I don't see any studio ending an Anime season with a cliffhanger. Not doing volume 4 is similar to stopping brutally in the middle of a volume, as I consider V3-4 to be a long story.
Anime seasons usually end with some elements that make you feel pumped for a second season. But it's nothing as inconclusive as cutting at Vol 3. If that happens, there should be some kind of original twist to have Kurumi and Shidou do some stuff so there won't be an abrupt end.
Otherwise, there's still the 12+3 episodes scenario. Similar to what happened with OreImo S1, Bakemonogatari and Kokoro Connect.
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