The "story" of this specific episode (which aired in June 2022) focuses on the battle at Onigashima and a major character moment for Sanji:

Sanji has been captured and tortured by Black Maria , one of Kaido's Tobiroppo. Because of his personal code never to hit a woman, he is defenseless against her.

Black Maria tries to force Sanji to call for Nico Robin , intending to lure her into a trap so the Beast Pirates can capture her for her ability to read Poneglyphs.