Based on Akagawa Jirou's popular book series about hapless detective Katayama Yoshitaro who lives with his sister Harumi and their cat Holmes, which has a sixth sense when it comes to solve mysteries. 
In this stand alone OVA the aftershow party of Harumi's acting troupe becomes the showplace of murder and tragedy. Luckily Yoshitaro brought Holmes along. 
(Source: AniDB)

An OVA depicting the early events of the Glass no Kamen series. 
Kitajima Maya is a young girl from a poor background with no talents of use to school or her widowed mother. However, she is obsessed with movies, theatrical plays and TV dramas-to the point of remembering every line from a movie she's seen once, and dramatically acting out the stories, including every character, for anyone who will listen. One day, she encounters an old woman with a scarred face who claims that Maya is the girl she's been looking for-for the old woman has spent years protecting the rights to a 'legendary' play.

Office TWO - ONE