the Kanbaru arc which seems to be the final arc
That's the final arc chronologically, but there are still a number of unresolved/unrevealed things that will be/are being dealt with in the ongoing season, Owarimonogatari, which is very good so far.
I find the character Nadeko Sengoku impossible to understand
Her issue was that she felt forced to act overly cute to please other people, and eventually got sick of it and lashed out.
This is the monthly thread for posting media of various types that you've found that you enjoy. Post what you're reading, listening to, watching, and your opinion of it. Post recommendations to blogs. Post whatever media you feel like discussing! To see previous recommendations, check out the older threads.
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