GoGoAnime for your Android devices from  

Diamond no Ace OVA Description:

Plot Summary: First episode will be bundled with 44th manga volume. The limited-edition DVD will animate "Face -Kominato Ryousuke Special Bangai-hen-", which appeared in the Ace of Diamond Official Guidebook Ura and tells the "moving secret story of the Kominato brothers that cannot be seen in the television series."
Diamond no Ace OVA Episodes: