OVA bundled with a special edition of the manga's 3rd volume. 

The story of Onna no Sono Hoshi follows Hoshi-sensei as he experiences everyday adventures such as getting picked on by the girls in the daily classroom journal, getting saddled with looking after the class's pet dog, giving art advice to aspiring manga authors, and sometimes going out to drink with his coworkers. 
 
(Source: Crunchyroll)

Hoshi-sensei, homeroom teacher of class 4 of second-grade at an all-girls high school. At the mercy of the students' shiritori picture games they draw in their class journals, suddenly made to take care of a dog in the classroom, giving advice to an aspiring manga artist...not to mention drinking sessions with colleagues...what an uninteresting life, yet why is it so enjoyable and loveable?! An unexperienced manga that will make you smile no matter what.
 
(Source: Shodensha, translated)

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