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Ayumu Kasuga's Mail Order Life (also known as Osaka Simulator) is a fanmade doujin-ware game created by hirahira.net for Windows in 2004.
The game features Osaka (real name Ayumu Kasuga) of Azumanga Daioh. In this game, Osaka interacts with random objects in her room. She occasionally walks out of her room, and on returning, she brings back money which can be used to spend on items seen on advertisements on tv.
The items, when purchased, appear in Osaka's room, and over time she'll interact with those objects. The game acts more like a "virtual pet" than an actual game.