For once, a YouTube comment captures the essence of an OP as well as I could have: “Cute and Catchy.” The visuals demonstrate the show’s trademark smooth, silky dancing animation, while the theme’s tendency to “dance” between minor to major intervals is a big part of its catchiness. The last four bars bring the sequence to a dreamy, satisfying close.
The theme is called “Hanaha Odoru Reya Iroha ni Ho” (花ハ躍レヤいろはにほ) by Team Hanayamata (composed of the show’s five main seiyus). And as you’ve probably guessed by now, the title of the show is the first syllables of the five girls who will ultimately form the yosakoi group.
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