This is a series to collect the key-visual-like color illustration inserts by artist Shinchou ni Kansuru Kousatsu for the semi-annual Azumanga Daioh doujinshi compilation No Osaka No Life organized by artist Morichan.
Morichan often posts and uses them as promotional material. They usually, but may not always feature the character Kasuga Ayumu (Osaka). This series begins with No Osaka No Life #17 which was released in 2019 at Comiket 96 and has featured in every edition since to date.
Let's attempt to keep this sorted in chronological order.
See also: pool #23392 (Azumanga Daioh - No Osaka No Life covers - Morichan)