 If you liked
Koten-bu Series
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 ...then you might like
Kimi wa Houkago Insomnia
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It goes without saying that you can read Hyouka's novel/manga or even just watch the anime in order to enjoy "Insomniacs After School"!
If you were attatched to Hyouka's characters, please do yourself a favor and read the following manga, their characters are similar and it fulfilled exactly what Hyouka's fans never received (probably know what I mean).
Themes and atmosphere of these works are very similar, hence I'm sure you can binge the recommended manga as it's not difficult to read and one of *my* most ENJOYABLE manga read ever - 80 chapters/9 volumes so far by the way!