Maria Kurenai is a very distant relative of Shizuka Hiou. She allows Shizuka to possess her body in exchange for being allowed to drink Shizuka's blood, which would strengthen her sickly body. Due to Shizuka's untimely death, this promise is never fulfilled. She seems to be fond of Ichiru, hugging Zero when she mistakes him for Ichiru, and asks Yuuki to tell Zero that if he sees Ichiru, to tell him Maria wants to see him again.

She returns to her family after Shizuka's death.When she sends an owl out to search for Ichiru, she witnesses Kaname's destruction of the Vampire Council and proceeds to spread the news. Maria returns to cross academy after Yuuki reassembles the night class

(Source: Wikipedia)