[Machine Translation] The devil is an angel's teacher. Mark, a veteran demon, is sentenced to work in the human world as punishment for a certain incident. Then, a pure and bubbly new angel named Ten is sent there! Although he is puzzled by the fact that his job is to "educate" this angel, Mark is surprisingly caring for the somewhat unreliable Ten. One night, he gives Ten a private lesson in "purification of sin" using Mark's body. ......? Eccentric, sweet, and spicy! A tale of an angel and a demon living together in the human world.