Only those blessed with sparks of black can perform ... users of this art. Nanami himself, however, calls this pure luck.

No character ... Black Flashes of anyone in the series, weakening Sukuna to the point of defeating him. That said, fans still have no idea what Yuji's Domain Expansion even was. For most JJK ...

including one “huge mistake” he made with a particular character. Gege Akutami recalls how he created Black Flash and admitted one 'huge mistake' during a recent JJK exhibition in Japan ...