Dai Matsumoto

Maaka Karin comes from a family of vampires living in Japan, but she is not a normal vampire. Vampires are normally supposed to drink the blood of their victims...but Karin suffers from a condition that causes her body to produce excessive amounts of blood. About once a month, she has to get rid of the excess blood by giving it to her "victims." But she somehow manages...she goes to school like everyone else her age. Well, things are about to get more complicated. When a new student, Usui Kenta transfers into Karin's class, she starts producing unusually huge amounts of blood, almost as if in reaction to him. Worse, he happens upon Karin's...true nature...

Yuji Kaido was diagnosed with a serious disease and cryogenically frozen. He wakes up more than 20 years later-and Earth is nothing like what he remembers. A race of alien bugs called the Blue has taken over the planet, and a few selected humans have retreated to the space station called Second Earth. Yuji is met by a group of humans from Second Earth that is trying to save him. Yuji and this group must survive the Blue-infested Earth and fight their way back to Second Earth. Things are not as simple as they seem, as the Blue are both powerful and mysterious, attacking only humans.