is jujutsu kaisen episode 25 filler?

The story jumps back to 2006. Second-year students Satoru Gojo and Suguru Geto — the 'strongest pair' at Jujutsu High — are assigned to escort Riko Amanai, the Star Plasma Vessel destined to merge with Master Tengen.

The mission introduces a younger Gojo: still arrogant, but without the absolute confidence that comes from knowing he's untouchable. He and Geto are equals.

That balance is about to break.