Sono Chi wa Koi ni mo Kusuri ni mo

One day, college student Harumi Ruka is rescued from a group of troublesome men by his high school classmate, Kagara Sousuke. He offers to repay him, but he flatly refuses, and no matter how many times he tries to get his attention afterward, he blatantly avoids him, telling him to "stay away." Just as he was about to give up, Ruka couldn't bear to leave Kagara, who seemed unwell, alone and approached him to help, only to have his lips devoured by his desires. And then, out of the blue, he tells him he's a vampire—!?