Board Thread:Questions and Answers/@comment-28937337-20160909003335/@comment-25942629-20160910203956

I also think Yu has a crush on Mika, although I never noticed it until my boyfriend pointed it out. Mika only seems concerned about Yu as his brother or last family member, and vampires do not feel sexual attraction anyway.

The anime made it look more like Mika was the one with the crush.