Oscar is a lonely 12-year-old boy who is often bullied. One night, a new neighbor came to his next door. He and the little girl next door, Allie, quickly became good friends. When Elly learned that Oscar was often bullied by Kony and others, she told Oscar to learn to fight back. During this period, there were frequent life cases in this cold Swedish town, and the dead were sucked up blood. It turns out that these were all done by Eric, Ellie's "father", who is actually a vampire, and she lives by sucking human blood. One day, Ellie's "father" was discovered while collecting human blood. He was immediately arrested and disfigured. Eric said to Ellie who came to look for him, hoping that Ellie would help him get rid of the pain.
Oscar was provoked by Kony and others in a camp organized by the school. Oscar, who had become brave, taught Kony with a stick. Ellie, who lives alone, continued to search for the source of blood. She bit a woman named Virginia, but due to Rex's obstruction, she did not collect her blood. However, Virginia quickly became a vampire. When she was in the hospital, because the nurse accidentally opened the curtains, Virginia was turned to ashes under the sunlight. The angry Rex removed Ellie before, but Oscar suddenly appeared and saved Ellie's life. Oscar has already known the fact that Ellie is a vampire, but he has fallen in love with Ellie, and Ellie has taken Oscar as his spiritual support.
One night, Oscar was trained in the swimming pool. Kony and Jimmy and others came to him to settle the account. Jimmy let Oscar hold his breath in the water for 3 minutes, otherwise he would have to stroke him a few times. Oscar had no choice but to follow suit. At the time of the crisis, Ellie appeared in time, and she eliminated Conney, Jimmy and others. After that, Oscar and Ellie embarked on a journey away from home. Oscar got on the train, took the remaining money and belongings, and Ellie hidden in the box, and flew away.
