Riri is a mix between human and succubus. She is unable to drain men's energy well, so she is always starving. Today as well, her stomach is empty. However, she's incredibly unskilled in both love and romance, so she cannot find anyone from whom she can drain energy! Right at that moment, she happens to meet a man who has the most delicious energy. Despite being a succubus, she is slightly simple-minded, and finds him so delicious that she cannot stop herself... (Source: Shogakukan, translated)