The concept of friendship is the first step in building any sort of plot. You can't be betrayed if you're not a friend first. You almost never go into true love without a friendship first. Even the lack of a friendship (sociopaths, shut-ins, etc.) are portrayed by showing that a healthy life has friends. See, friendship's a foundation, and a foundation supports greater things. I'd say there's less series focusing simply on friendship alone, but most do use them to establish the true intentions of the characters.
Plus it's interesting, whether it's cute or if it's dark. A set of character studies, if you will.
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