She was never on the show. She did, however, appear in the opening credits.
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Because she publicly kissed Michael Jackson on stage during the 'Bad' world tour and it wasn't part of the show, Michael had to have control of everything that happened during his concerts and she took it upon herself to change the routine without telling him, he wasn't happy about it so she was fired.
its episode 4
It's the 17th episode in the 18th season.
Kirito and Asuna kiss each other in the following episodes: SAO - Crimson Killing Intent (Episode 10) SAO - The End of the World (Episode 14) SAO - The World Seed (Episode 25)
They first appeared in episode 7 then they went to the human world and they appeard again in episode 14