Karmagisa - Blood Slave (An Assassination Cl...
It was a shock for Nagisa when his childhood friend, Karma, who he didn't meet for years, became a new member of class 3-E. Later on, they became close friends, continuing their old friendship, but closer than before.
One night, Nagisa was on his way home alone. Suddenly, he found Karma between the buildings, who had a person's body in his hand. His mouth was full with blood. The truth revealed that Karma is a vampire, due to an accident. Helping his childhood friend, Nagisa offers hid blood to Karma since then.