Konya mo, Ecchi na Shiiku wa Chika no Shoko de...

"Since you're inexperienced, I'll just have to teach you" are the words said to Sayo, a young librarian who works hard at her job. She has lots of book knowledge about romance and sexual encounters, but zero experience. Suddenly, she is taken into the home of the heir to a large financial conglomerate, Shuya. Her lessons in what real sex is begin after she is caught peering into "The 48 Sexual Positions" down in the basement archives of his manor. Shuya tells her that she should put what she has learned in books to good use and pushes her body to overflow with pleasure as they try out different positions each night. "Have you heard of this one, Criss-cross Pine Needles?"

(Source: Manga Reborn)