It's sort of yuri. It mostly between a certain couple. As far as I've gotten, anyways. For anyone who has no idea what it is...
It's about Sumire Takahana who, while outside at school, gets saved by a mysterious girl from a monster. The girl gives her a flyer for "Venus Vangard", a victorian clothing store, and at the bottom reads "monster hunters". So she ends up getting recruited to help the girl, Lucia Nahashi, and her adopted father, Soichiro Nahashi, fight against viruses. Viruses are creatures, normally really stupid, that eat human souls in order to turn them into viruses.