Koi to Himitsu no Gakuseiryou

In Asahi's school, there are two types of students: the ones from the elite class and the ones from average one.

After an accident in her house, she starts living in the rooms of the elite class, but no one must know, or else she would be expelled. By chance, a black haired guy from the elite discovers her secret...

(Source: MU, edited)