円舞一閃 sits at a slightly different naming register than the twelve core Hinokami Kagura dances documented elsewhere in this dictionary, and that difference is worth calling out explicitly. Flame Dance, Fake Rainbow, Solar Heat Haze, Beneficent Radiance — the base set reads like an inherited, closed vocabulary of natural and celestial imagery, the kind of fixed repertoire a dance would have if it had been passed down through generations largely unchanged. 一閃 ("a flash"), by contrast, is a generic finishing-move suffix that shows up constantly across totally unrelated breathing styles in this series — it's the kind of word a swordsman appends to describe how a strike lands, not a proper noun handed down with the choreography. Appending it to 円舞 produces a name that reads less like a thirteenth inherited dance and more like Tanjiro, mid-fight, describing what he just did with an existing dance: he danced the Circling Dance, and it landed in a flash. VIZ's "DANCING FLASH!" preserves that same slightly looser, more descriptive register in English — it reads more like a battle cry improvised in the moment than like a name with the ceremonial weight of "SETTING SUN TRANSFORMATION!" or "BENEFICENT RADIANCE!"
That distinction matters because it previews something the series confirms explicitly much later: Volume 22's climax reveals that Hinokami Kagura isn't actually a fixed set of techniques at all, but breathing performed correctly and sustained indefinitely — the twelve "forms" are really one continuous dance that, cycled enough times, generates additional named moments within it. 円舞一閃, appearing back in Volume 15 during the Swordsmith Village arc — well before that revelation — reads in hindsight like the manga quietly demonstrating its own thesis ahead of explaining it: Tanjiro combining a base dance (円舞) with an in-the-moment flourish (一閃) rather than reaching for a thirteenth pre-set name is exactly the kind of improvisation the series later argues Hinokami Kagura was always built to allow. It's a small but genuine piece of foreshadowing hiding inside what looks, on first read, like just another flashy attack name.
One OCR note on this entry's citation: the stylized, large-format vertical kanji used for this callout defeated the corpus's text recognition, which captured only scattered fragments and stray characters ("いっ、せーん２０１８年えん．．．ただ") rather than the clean "円舞一閃" actually printed on the page. The corpus's own pipeline flags this as a corrected reading; the rawCapture field above preserves the raw OCR output exactly as generated, per this dictionary's sourcing policy, while nameJp above reflects the correct printed text as confirmed directly against the page image.