A dream world where you can borrow an H sister who specializes in "sex education" in the library! You can teach H next to your classmates studying, or you can take it home and teach it! It's just as natural as borrowing a book and reading it! Erika Kitagawa, Saya Aika, Nozomi Hazuki, Riona Minami, Aiko Endo are a dream time to teach you sex gently and politely!