Mikeneko Holmes no Yuurei Joushu  

三毛猫ホームズの幽霊城主, Calico Cat Holmes and the Lord of the Haunted Castle

The anime "Akagawa Jirous" follows the story of detective Katayama Yoshitaro, who lives with his sister Harumi and their cat Holmes, which possesses a sixth sense for solving mysteries. In this standalone OVA, tragedy strikes at an afterparty hosted by Harumis acting troupe. Fortunately, Yoshitaro brings along Holmes to help solve the murders that occur.