Haru Shibasaki, in her second year at the Goods Division, is pure and sincere, with a strong core! She's said to be a karate black belt and even a calligraphy master! And the contrast between her appearance and reality is intense! Her sex was super erotic...! She loved everything from kissing to fellatio, insertion, and deep penetration... For the development of a new product, an onahole, she makes a certain decision to analyze her own vaginal data as a sample...