^
Probably a scheduling conflict. Aya's not there either.
Asuka is really getting into the Hello Project universe. She was long gone when "I Wish" was written. She must have learned it just to make this appearance. When she showed up for the Ai no Tane 20th Anniversary recording last fall, I thought she'd be around for a few anniversary things and then go back to her regular life and (non-Hello Project) career; but now it's like she's a regular OG and she's coming to all these nostalgia events even for times in the group's history that she was never a part of.