Nobody no how come Maria got in to kurosu academy so this is what i think happen

Maria was asleep in her bed and she was having a dream that Shizuka Hio was telling her that she could save her.
Shizuka Hio said that if she let her possess her body in exchange for being allowed to drink Shizuka Hio's blood, which would strengthen her sickly body. Maria said yes to this 2 weeks later Ichiru came to Maria's house and tock her to a house with no widows then Maria and Shizuka Hio changed bodys. then Maria

Then Maria told her parents that she was no longer sick and would like to go to Kurosu academy. Maria parents asked the heard master if Maria could join the school.
He said that she could join in 2 weeks. So Maria packed her stuff and told Ichiru. 2 weeks later Maria and Ichiru went to Kurosu academy.