Kishukusha No Kuroneko Wa Yoru Wo Shiranai

[From BL Tsundoku Scans]:The sons of respectable families from around the world gather at the boarding school Collge Blanc High School. Yuki, a first-year in Class A from the Mix House dorm, is a scholarship student at the top of his grade. He is aloofa lone wolf.Only one dares approach him: the head boy, Jean. Adored by all the school, Jean's word is absolute. But one day, their classmate Aula is attacked by someonein the school! On his neck is a bizarre wound resembling the bite of a vampire?!+