K-ON

A female anime character with long dark hair and a school uniform appears in a classroom setting, her expression shifting from neutral to a wide-eyed, smiling pose with her fists clenched in a determined gesture. The scene cuts to a person in a full suit of knight's armor, including a helmet and chainmail, sitting at a table and looking down at a smartphone, then suddenly lurches forward and falls out of frame. The sequence returns to the anime character, now with cat ears and red eyes, repeating the determined pose, before showing her in the same classroom with a more subdued expression.