In the Snow

What happens when Yuki's adoptive sister, Yumi Cross, attends the night class and is the only human in said class? A new student named Matsuki Ashiyo joins Cross Academy and catches Yuki's eye while a vampiress named Akahana Sato joins the night class, capturing Kaname's attention. What happens when Yumi notices her childhood friend Zero in a whole new way? Is love in the air or with it hit the fan?