User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-3965848-20150421211347/@comment-1359322-20150422104738

I don't think Kiba realizes Tsubaki's feelings yet. But i think he somewhat is aware of it, that's the feeling i get when i read Volume 12.5 when Rias ask Yuuto to assist Tsubaki.