Yuma Nikaido is the protagonist of this drama. He plays a vampire who comes to earth in search of eternal life and lives as a high school student. In the drama, he falls in love with his high school teacher, Rosa Kato, who is nine years older than him. However, Nikaido himself said: "The filming was very enjoyable. Although I have never been in a relationship with an older woman, I do feel that love has little to do with age. I hope everyone will be moved after watching it." Kato also said: "Although it's a forbidden love, since it's summer, we still need to ignite our passion."