"Just keep quiet. I won't do anything bad to you." Every day, an egotistical demon pressures you into having sex!? A flashy demon with horns, Zwart, suddenly appears in front of Fujino Haruki, a lonely college student. He demands his soul in order to return to the demon world, and when Haruki refuses, he complains of hunger and reaches for Haruki's lower body!! Even though Haruki wants to resist the unreasonable demands, he is swept away by the pleasure of his body. What will become of this dangerous, sexy life together with a sadistic and extremely egotistical demon?!