is jujutsu kaisen episode 21 filler?

The aftermath of the invasion settles into an unexpected detour: the students finish the Goodwill Event with a baseball game. It's a moment of levity that lets the characters breathe.

Meanwhile, Geto's allies — the cursed spirits and Kenjaku — advance their preparations for what comes next. The contrast between the students' normalcy and the conspiracy forming around them creates the tension that defines JJK: every happy moment exists on borrowed time.