is bleach episode 18 filler?

At Karakura High School, on the last day of school, Ichigo Kurosaki sets his bag down on his desk and mentally notes that he does not have any sense of being at school right now, nor can he feel how he was nearly killed by 6th Division Lieutenant Renji Abarai and Captain Byakuya Kuchiki last night, the fact that Rukia Kuchiki is no longer here, or the fact that no one remembers her. When Keigo Asano performs Don Kanonji's signature pose and laugh while standing with him and a stoic Yasutora Sado, an unimpressed Mizuiro Kojima questions if he is really still doing that, prompting Keigo to counter by claiming that the time is right for him to keep doing it.