Ayumu Kasuga, affectionately nicknamed "Osaka," is the breakout star of the surreal high school comedy Azumanga Daioh. Known for her slow-moving thought process, bizarre daydreams, and infectious catchphrases like "Sata Andagi," she became an early internet icon. The meme typically utilizes her vacant, wide-eyed stare to represent a total lack of mental activity or a reaction to something nonsensical. Osaka's popularity surged again in the 2020s through surrealist edits and ironic shitposting, cementing her status as the queen of "no thoughts, head empty" energy in anime culture.