Natsume Yuujinchou, Hyouka Recommendations
Both give a similar feeling. Stories aren't alike at all but both share a quiet and mysterious atmosphere.
The friendship is important in both. Natsume and Oreki aren't social people, but they finally create a group of friend around them.
Plus, both anime refer to a traditional aspect of Japan.
Though the stories are different, both give off a similar vibe and atmosphere. Both also begin with a protagonist who doesn't interact with others often. As the story progresses, both protagonists slowly begin to make friends and find their place in the world. The art in both is lovely and gives off a "warm" feeling. Both contain different types of traditional Japanese culture.
Talking about all four of the natsume seasons as a whole. Very very similar feelings, in a good way, in which almost every episode is the beginning of a new issue, with some issues extending on to later episodes and so on. Natsume in contrast focuses more on friendship than hyouka, and includes romance, but not directed toward the main character. Both main male characters undergo significant maturation and mental changes, and both anime leave you with an oddly satisfied and happy feeling after each issue is concluded.