Board Thread:Questions and Answers/@comment-26921356-20170331204322/@comment-32743678-20170401005235

To answer that question for you, its Kazuki Muto and Tokiko Tsumura from Buso Renkin. Buso Renkin has similarities with Fullmetal Alchemist for different reasons, if anyone has heard of Fullmetal Alchemist should take a very good look at Buso Renkin.