Charlotte was born into House Roselei. ... At that point, Charlotte falls in love with Yami, effectively having her heart stolen, which stops the curse but does not remove it.

Does Yami know Charlotte likes him?

Therefore we can conclude that he is not aware of her affection for him. However, despite having no knowledge of Charlotte's feelings for him, Yami holds a lot of respect for her strength and cares for her as a fellow Magic Knight's Captain.

Does Yami have a love interest?

Yami doesn't have a girlfriend, but he does have someone walking around with a rather huge crush on him. Charlotte Roselei of the Blue Rose is deeply in love with Yami.