"I want to know a lot of things I don't know," said An Kunoha, a slightly naughty girl who jumped into the world of AV. Kyou-chan, who says that she tended to slack off at school, is invited to a special class this time. - Ecchi's "first 4 subjects" will be taught thoroughly by professional male priority students. I got to know a lot of firsts, and I wonder if I could become an adult again.