Tanehisa Busujima is a middle-aged university professor well known for his lack of restraint and speaking his mind (for better or worse). His compulsions have put his job in jeopardy. The university's president provides him with a lifeline, though: Serve as an instructor for study abroad students from the Succubus Kingdom! Not present anywhere in the Human Realm, the Succubus Kingdom is located in an entirely different world known as the Dream Realm. This begs the question: why are there study abroad students from another world attending a university in Japan? Well, the Japanese government made a trade agreement with the Succubus Kingdom: the Succubus Kingdom is to assist in resolving the declining birthrate in Japan, and in exchange, the Japanese government will provide the Succubus Kingdom with male energy. And wouldn't you know it? Busujima, is a perfect candidate for supplying said energy. His responsibility as an instructor is to teach the foreigners about the Human Realm... On paper, at least. However, according to the program's director, Lima, his true objective is to rehabilitate failed succubi, and the two delinquents he’s in charge of will surely be a handful. Class is now in session!

Tanehisa Busujima is a middle-aged university professor well known for his lack of restraint and speaking his mind (for better or worse). His compulsions have put his job in jeopardy. The university's president provides him with a lifeline, though: Serve as an instructor for study abroad students from the Succubus Kingdom! Not present anywhere in the Human Realm, the Succubus Kingdom is located in an entirely different world known as the Dream Realm. This begs the question: why are there study abroad students from another world attending a university in Japan? Well, the Japanese government made a trade agreement with the Succubus Kingdom: the Succubus Kingdom is to assist in resolving the declining birthrate in Japan, and in exchange, the Japanese government will provide the Succubus Kingdom with male energy. And wouldn't you know it? Busujima, is a perfect candidate for supplying said energy. His responsibility as an instructor is to teach the foreigners about the Human Realm... On paper, at least. However, according to the program's director, Lima, his true objective is to rehabilitate failed succubi, and the two delinquents he’s in charge of will surely be a handful. Class is now in session!