is one piece episode 785 filler?

The Sanji Retrieval Team reacts in shock to the mysterious woman being on their ship, realizing from her comment about Yonji being her little brother that she must be Sanji's older sister as well. Yonji then jumps out of the water and expresses his annoyance at his sister, Reiju, as he hovers in midair.

The team is bewildered by Yonji's ability to float, and wonder if it is a Devil Fruit, but Nami says he would have been incapacitated by the water if that were the case.