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Ayumu Kasuga is a fictional high school character from manga and anime series Azumanga Daioh. She is often called by the nickname Osaka by her friends, the city Ayumu from which she transferred. She is also known in memes as Osaker after a resurgence in popularity in 2023. She and the show have been the subject of several memes in the 2010s and 2020s. Origin Between March and April of 1999, the second chapter of the Azumanga Daioh manga series debuted in Gekkan Komikku Dengeki Daioh magazine.[1] In part 1 of the chapter, Ayumu is introduced as a transfer student from Osaka (shown below