Naruto Episode 135 Link

Explain why the are considered "filler."

The "promise" referenced in the title is the one Naruto made to Sakura Haruno: that he would bring Sasuke back "no matter what." When Naruto wakes up in the hospital and sees Sakura, the atmosphere is heavy with the reality of his failure. Despite his broken body, Naruto reaffirms his vow, but Sakura realizes the immense burden she has placed on him. This moment catalyzes her own growth, leading her to seek apprenticeship under Tsunade to become a medical ninja so she can fight alongside Naruto rather than watching from the sidelines. Narrative Significance Naruto Episode 135

The episode begins in the somber quiet following the explosive battle between Naruto Uzumaki and Sasuke Uchiha. While Naruto lies unconscious in the rain, Sasuke stands over him, having barely emerged victorious. In a moment of significant character development, Sasuke chooses not to kill Naruto to obtain the Mangekyo Sharingan, rejecting the path his brother Itachi laid out for him. Instead, he departs for Orochimaru’s lair, severing his ties to the Hidden Leaf Village. This decision solidifies Sasuke as a rogue ninja and sets the stage for his descent into darkness over the next several years. The Cost of the Mission Explain why the are considered "filler