Pochiyama at the Pharmacy

Pochiyama-san works at a local pharmacy. She is a loner and seldom speaks; instead she writes what she wants to say on... well you'll see for yourself once you read this short and humorous one-shot.
(Source: Mangaupdates)
Four installments have been released to date, once every year since 2005. The fourth and most recent was published on 30 December 2008. The first three installments were published together as an internationally available iPod Touch / iPhone app (with a rather poorly-made official English translation) via the iTunes App Store on 14 August 2008.