is one piece episode 799 filler?

As night falls, Sanji continues staring out of his balcony, and he is approached by Reiju. Reiju tries to get him to go to sleep, but Sanji continues to treat her coldly.

She reveals that Ichiji and Niji are returning tomorrow, and Sanji solemnly remembers his two older brothers along with Yonji bullying him. Reiju reminds him that tomorrow will be a busy day before she leaves, but Sanji stays where he is.

He takes notice of a butterfly flying around, but the butterfly draws his attention toward his exploding handcuffs, angering him.